Question: Use the information given in the previous

> Suppose that fund-raisers at a university call recent graduates to request donations for campus outreach programs. They report the following information for last year’s graduates: Three attempts were made to contact each graduate. A do

> Consider the random variable y = the number of broken eggs in a randomly selected carton of one dozen eggs. Suppose the probability distribution of y is as follows: a. Only y values of 0, 1, 2, 3, and 4 have probabilities greater than 0. What is p (4)?

> Two six-sided dice, one red and one white, will be rolled. List the possible values for each of the following random variables. a. x = sum of the two numbers showing b. y = difference between the number on the red die and the number on the white die (r

> A person is asked to draw a line segment that they think is 3 inches long. The length of the line segment drawn will be measured and the value of x = (actual length + 3) will be calculated. a. What is the value of x for a person who draws a line segment

> State whether each of the following random variables is discrete or continuous. a. The number of courses a student is enrolled in b. The time spent completing a homework assignment c. The length of a person’s forearm d. The number of times out of 10

> A person stands at the corner marked A of the square pictured in the previous exercise and tosses a coin. If it lands heads up, the person moves one corner clockwise, to B. If the coin lands tails up, the person moves one corner counterclockwise, to D. T

> A point is randomly selected from the interior of the square pictured here: Let x denote the distance from the lower left-hand corner A to the selected point. What are possible values of x? Is x a discrete or a continuous variable? B C A D. 1 foot

> Classify each of the following random variables as either discrete or continuous: a. The fuel efficiency (miles per gallon) of an automobile b. The amount of rainfall at a particular location during the next year c. The distance that a person throws a

> A box contains four slips of paper marked 1, 2, 3, and 4. Two slips are selected without replacement. List the possible values for each of the following random variables: a. x = sum of the two numbers b. y = difference between the first and second numb

> Starting at a particular time, each car entering an intersection is observed to see whether it turns left (L), turns right (R), or goes straight ahead (S). The experiment terminates as soon as a car is observed to go straight. Let x denote the number of

> State whether each of the following random variables is discrete or continuous: a. The number of defective tires on a car b. The body temperature of a hospital patient c. The number of pages in a book d. The number of draws (with replacement) from a

> In a national sample of 1907 American adults, 1297 indicated that they own a smartphone (“technology Device ownership: 2015,” pew research center). Assume that it is reasonable to regard this sample as a random sample of adult Americans. Is it reasonable

> If a hurricane were headed your way, would you evacuate? The headline of a press release issued January 21, 2009, by the survey research company international communications research (icrsurvey.com) states, “Thirty-one Percent of People on High-Risk Coas

> The paper “effects of caffeine on repeated Sprint ability, reactive agility time, Sleep and next Day performance” (Journal of Sports Medicine and Physical Fitness [2010]: 455–464) describes an experiment in which male athlete volunteers who were consider

> Samples of both surface soil and subsoil were taken from eight randomly selected agricultural locations in a particular county. The soil samples were analyzed to determine surface pH and subsoil pH, with the results shown in the accompanying table. a.

> Here’s one to sink your teeth into: The authors of the article “analysis of food crushing Sounds During mastication: total Sound Level Studies” (Journal of Texture Studies [1990]: 165â€&#14

> The paper “the truth about Lying in online Dating profiles” (Proceedings, Computer-Human Interactions [2007]: 1–4) describes an investigation in which 40 men and 40 women with online dating profiles a

> Head movement evaluations are important because disabled individuals may be able to operate communications aids using head motion. The paper “constancy of head turning recorded in healthy Young humans” (Journal of Biom

> The article “a Shovel with a perforated blade reduces energy expenditure required for Digging wet clay” (Human Factors, 2010: 492–502) described a study in which each of 13 workers performed a task us

> The paper referenced in the previous exercise also gave information on calorie content. For the sample of Burger King meal purchases, the mean number of calories was 1008, and the standard deviation was 483. For the sample of McDonald’s meal purchases, t

> The paper “Sodium content of Lunchtime fast food purchases at major U.S. chains” (Archives of Internal Medicine [2010]: 732–734) reported that for a random sample of 850 meal purchases made at Burger King, the mean sodium content was 1685 mg, and the sta

> Do male college students spend more time studying than female college students? This was one of the questions investigated by the authors of the paper “an ecological momentary assessment of the physical activity and Sedentary behaviour patterns of Univer

> For each of the following hypothesis testing scenarios, indicate whether or not the appropriate hypothesis test would be for a difference in population means. If not, explain why not. Scenario 1: The authors of the paper “adolescents and mp3 players: to

> Descriptions of three studies are given. In each of the studies, the two populations of interest are students majoring in science at a particular university and students majoring in liberal arts at this university. For each of these studies, indicate whe

> An individual can take either a scenic route to work or a nonscenic route. She decides that use of the nonscenic route can be justified only if it reduces the mean travel time by more than 10 minutes. a. If µ1 refers to the mean travel time for nonsceni

> Use the information in the previous exercise to construct a 95% bootstrap confidence interval to estimate the difference in mean one-year improvement in ADHD Severity Score for the ONTRAC treatment and the control treatment. Interpret the interval in con

> A new set of cognitive training modules called “ONTRAC” was developed to help children with attention deficit/hyperactivity disorder (ADHD) to improve focus and to more easily dismiss distractions (“t

> Use the information in the previous exercise to construct a 95% bootstrap confidence interval to estimate the mean difference in change in brain activity, HC − LC. Interpret the interval in context. You can use make use of the Shiny app

> Behavioral intervention treatments may affect perceptions of reward in human brains, and thus help people to manage weight loss. In one of the first studies relating brain activity related to rewards and weight loss, researchers recorded brain activity a

> Use the information in the previous exercise to construct a 95% bootstrap confidence interval to estimate the difference in mean Personal Meaning scores for patients with cancer in the high-dose and low-dose psilocybin groups. Interpret the interval in c

> Studies have been conducted to evaluate the effectiveness of psilocybin mushrooms on improving the quality of life for patients with cancer (“a Dose of a hallucinogen from a ‘magic mushroom,’ and then

> Use the information given in the previous exercise to construct a 95% bootstrap confidence interval to estimate the difference in mean average working heart rates for the driver in teams of two firefighters and the driver in teams of from three to five f

> The Sheboygan (Wisconsin) Fire Department received a report on the potential effects of reductions in the number of firefighters it employs (“Study of fire Department causes controversy,” USA ToDAy NETWoRK-Wisconsin, D

> Use the information given in the previous exercise to calculate a 95% bootstrap confidence interval to estimate the mean difference in movement, OFF – CL. Interpret the interval in context. You can use make use of the Shiny apps in the collection at stat

> New “closed loop” (CL) devices have been developed to help to suppress overactive brain activity in patients with conditions such as Parkinson’s disease and epilepsy (“conceptualizat

> The online article “Death metal in the operating room” (www.npr.org, December 24, 2009) describes an experiment investigating the effect of playing music during surgery. One conclusion drawn from this experiment was that doctors listening to music that c

> The paper “Supervised exercise Versus non-Supervised exercise for reducing weight in obese adults” (The Journal of Sports Medicine and Physical Fitness [2009]: 85–90) describes an experiment in which

> The paper “the effect of multitasking on the grade performance of business Students” (Research in Higher Education Journal [2010]: 1–10) describes an experiment in which 62 undergraduate business stud

> The paper “Supervised exercise Versus nonSupervised exercise for reducing weight in obese adults” (The Journal of Sports Medicine and Physical Fitness [2009]: 85–90) describes an experiment in which p

> The paper “the effect of multitasking on the grade performance of business Students” (Research in Higher Education Journal [2010]: 1–10) describes an experiment in which 62 undergraduate business stud

> The article referenced in the previous exercise also described an experiment in which students at Columbia Business School were randomly assigned to one of two groups. Students in one group were shown a coffee mug and asked how much they would pay for th

> The article “why we fall for this” (AARP Magazine, may/June 2011) describes an experiment investigating the effect of money on emotions. In this experiment, students at University of Minnesota were randomly assigned to one of two groups. One group counte

> The article “Dieters Should Use a bigger fork” (Food Network Magazine, January/February 2012) described an experiment conducted by researchers at the University of Utah. The article reported that when people were randomly assigned to either eat with a sm

> The authors of the paper “the empowering (Super) heroine? the effects of Sexualized female characters in Superhero films on women” (Sex Roles [2015]: 211–220) were interested in the effect on female viewers of watching movies in which female heroines wer

> The paper “Does the color of the mug influence the taste of the coffee?” (Flavour [2014]: 1–7) describes an experiment in which subjects were assigned at random to one of two treatment groups. The 12 people in one group were served coffee in a white mug

> The paper “if it’s hard to read, it’s hard to Do” (Psychological Science [2008]: 986–988) described an interesting study of how people perceive the effort required

> The accompanying data on food intake (in Kcal) for 15 men on the day following two nights of only 4 hours of sleep each night and for 15 men on the day following two nights of 8 hours of sleep each night is consistent with summary quantities in the paper

> The paper “effects of caffeine on repeated Sprint ability, reactive agility time, Sleep and next Day performance” (Journal of Sports Medicine and Physical Fitness [2010]: 455–464) describes an experiment in which male athlete volunteers who were consider

> The paper “Supervised exercise Versus non-Supervised exercise for reducing weight in obese adults” (The Journal of Sports Medicine and Physical Fitness [2009]: 85–90) describes an experiment in which participants were randomly assigned either to a superv

> Is injecting medical cement effective in reducing pain for people who have suffered fractured vertebrae? The paper “a randomized trial of Vertebroplasty for osteoporotic Spinal fractures” (New England Journal of Medici

> The accompanying data on food intake (in Kcal) for 15 men on the day following two nights of only 4 hours of sleep each night and for 15 men on the day following two nights of 8 hours of sleep each night are consistent with summary quantities in the pape

> Use the information in the previous exercise to estimate the difference in the mean number of correct answers for the two different methods. Use a 95% confidence level, and be sure to interpret the interval in the context of the experiment.

> Can moving their hands help children learn math? This question was investigated in the paper “gesturing gives children new ideas about math” (Psychological Science [2009]: 267–272). Eighty-five childr

> The article “an alternative Vote: applying Science to the teaching of Science” (The Economist, may 12, 2011) describes an experiment conducted at the University of British Columbia. A total of 850 engineering students enrolled in a physics course partici

> The paper “Short-term Sleep Loss Decreases physical activity Under free-Living conditions but Does not increase food intake Under time-Deprived Laboratory conditions in healthy men” (American Journal of Clinical Nutrition [2009]: 1476–1483) describes an

> The paper “the effect of multitasking on the grade performance of business Students” (Research in Higher Education Journal [2010]: 1–10) describes an experiment in which 62 undergraduate business students were randomly assigned to one of two experimental

> Research has shown that for baseball players, good hip range of motion results in improved performance and decreased body stress. The article “functional hip characteristics of baseball pitchers and position players” (The American Journal of Sports Medic

> Are girls less inclined to enroll in science courses than boys? One study (“intentions of Young Students to enroll in Science courses in the future: an examination of gender Differences” (Science Education [1999]: 55&a

> Wayne Gretzky was one of ice hockey’s most prolific scorers when he played for the Edmonton Oilers. During his last season with the Oilers, Gretzky played in 41 games and missed 17 games due to injury. The article “the

> A researcher at the Medical College of Virginia conducted a study of 60 randomly selected male soccer players and concluded that players who frequently “head” the ball have a lower mean IQ than those who do not (USA To

> A newspaper story headline reads “gender plays part in monkeys’ toy choices, research finds—Like humans, male monkeys choose balls and cars, while females prefer Dolls and pots” (Kni

> Use the information given in the previous exercise to estimate the difference in mean GPA for students at the University of Central Florida who are employed and students who are not employed. Use a 90% confidence level to produce your estimate.

> In a study of the effect of college student employment on academic performance, the following summary statistics for GPA were reported for a sample of students who worked and for a sample of students who did not work (University of Central Florida Underg

> In a study of malpractice claims where a settlement had been reached, two random samples were selected: a random sample of 515 closed malpractice claims that were found not to involve medical errors and a random sample of 889 claims that were found to in

> Use the information given in the previous exercise to construct and interpret a 95% confidence interval estimate of the difference in mean brain volume for children with and without ADHD.

> Do children diagnosed with attention deficit/ hyperactivity disorder (ADHD) have smaller brains than children without this condition? This question was the topic of a research study described in the paper “Developmental trajectories of

> Use the information given in the previous exercise to construct and interpret a 95% confidence interval estimate of the difference in mean daily calorie intake for teens who do eat fast food on a typical day and those who do not.

> What impact does fast-food consumption have on various dietary and health characteristics? The article “effects of fast-food consumption on energy intake and Diet Quality among children in a national household Study” (

> Research has shown that, for baseball players, good hip range of motion results in improved performance and decreased body stress. The article “functional hip characteristics of baseball pitchers and position players” (The American Journal of Sports Medi

> The article “plugged in, but tuned out” (USA ToDAy, January 20, 2010) summarizes data from two surveys of kids age 8 to 18. One survey was conducted in 1999 and the other was conducted in 2009. Data on number of hours

> Reduced heart rate variability (HRV) is known to be a predictor of mortality after a heart attack. One measure of HRV is the average normal-to-normal beat interval (in milliseconds) for a 24-hour time period. Twenty-two heart attack patients who were dog

> Internet addiction has been described as excessive and uncontrolled Internet use. The authors of the paper “gender Difference in the relationship between internet addiction and Depression” (Computers in Human Behavior [2016]: 463–470) used a score design

> The authors of the paper “influence of biofeedback weight bearing training in Sit to Stand to Sit and the Limits of Stability on Stroke patients” (The Journal of Physical Therapy Science [2016]: 3011–

> Use the information in the previous exercise to answer the following questions. a. Construct a 95% confidence interval estimate of the difference in mean time spent on Facebook for male college students and female college students in Southern California

> The paper “facebook Use and academic performance among college Students: a mixed-methods Study with a multiethnic Sample” (Computers in Human Behavior [2015]: 265–272) describes a survey of a sample of 66 male students and a sample of 195 female students

> The paper “pathological Video-game Use among Youth ages 8 to 18: a national Study” (Psychological Science [2009]: 594–705) included the information in the accompanying table about video game playing t

> The paper referenced in the Preview Example of this chapter (“mood food: chocolate and Depressive Symptoms in a cross-Sectional analysis,” Archives of Internal Medicine [2010]: 699–703) describes a study that investigated the relationship between depress

> Do female college students spend more time watching TV than male college students? This was one of the questions investigated by the authors of the paper “an ecological momentary assessment of the physical activity and Sedentary behaviour patterns of Uni

> The report referenced in the previous exercise also gave data for representative samples of 250 adults in Canada and 250 adults in England. The sample mean amount of sleep on a work night was 423 minutes for the Canada sample and 409 minutes for the Engl

> The National Sleep Foundation surveyed representative samples of adults in six different countries to ask questions about sleeping habits (“2013 international bedroom poll Summary of findings,” www.sleepfoundation.org/sites /default/files/rpt495a.pdf, re

> The article “genetic tweak turns promiscuous animals into Loyal mates” (Los Angeles Times, june 17, 2004) summarizes a research study that appeared in the June 2004 issue of Nature. In this study, 11 male meadow voles

> Use the information in the previous exercise to answer the following questions. a. Construct a 90% confidence interval estimate of the difference in mean Flesch reading ease score for healthrelated pages on Wikipedia and health-related pages on WebMD.

> Many people now turn to the Internet to get information on health-related topics. The paper “an examination of health, medical and nutritional information on the internet: a comparative study of wikipedia, webmD and the mayo clinic websites” (The Interna

> Example 13.5 looked at a study comparing students who use Facebook and students who do not use Facebook (“facebook and academic performance,” Computers in Human Behavior [2010]: 1237–1245). In addition to asking the students in the samples about GPA, eac

> In a study of memory recall, 8 students from a large psychology class were selected at random and given 10 minutes to memorize a list of 20 nonsense words. Each was asked to list as many of the words as he or she could remember both 1 hour and 24 hours l

> Babies born extremely prematurely run the risk of various neurological problems and tend to have lower IQ and verbal ability scores than babies who are not premature. The article “premature babies may recover intelligence, Study Says&ac

> Breast feeding sometimes results in a temporary loss of bone mass, as calcium is depleted in the mother’s body to provide for milk production. The paper “bone mass is recovered from Lactation to postweaning in adolesce

> In a study of memory recall, 8 students from a large psychology class were selected at random and given 10 minutes to memorize a list of 20 nonsense words. Each was asked to list as many of the words as he or she could remember both 1 hour an

> Suppose you are given the computer output shown. You want to test the hypothesis, b = 1.0. Describe how you would use the computer output to test this hypothesis. Linear Fit y = 5.6452776 + 0.9797401*x Summary of Fit RSquare RSqureAdj Root Mean Squa

> Researchers in Hawaii have recently documented a large increase in the prevalence of a bird parasite known as chewing lice (“explosive increase in ectoparasites in hawaiian forest birds,” The Journal of Parasitology [2

> Ruffed grouse are a species of birds that nest on the ground. Because of this, chick survival at night in the first few weeks of life depends on avoiding predators. Biologists have theorized that protection from predators might be supplied by the mother

> There are 4 basic assumptions necessary for making inferences about b, the slope of the population regression line. a. What are the four assumptions? b. Which assumptions can be checked using sample data? c. What statistics or graphs would be used to

> Theropods were carnivorous dinosaurs, characterized by short forelimbs, living in the Jurassic and Cretaceous periods. (Tyrannosaurus rex is classified as a Theropod.) What scientists know about therapods is based on studying incomplete skeletal remains.

> The SAT and ACT exams are often used to predict a student’s first-term college grade point average (GPA). Different formulas are used for different colleges and majors. Suppose that a student is applying to State U with an intended major in civil enginee

> In the context of the simple linear regression model, explain the difference between a and a. Between b and b. Between σe and se.

> Explain what distinguishes a deterministic model from a probabilistic model.

> The authors of the article “Age, Spacing and Growth Rate of Tamarix as an Indication of Lake Boundary Fluctuations at Sebkhet Kelbia, Tunisia” ( Journal of Arid Environments [1982]: 43–5 1) used a sim

> The production of pups and their survival are the most significant factors contributing to gray wolf population growth. The causes of early pup mortality are unknown, and difficult to observe. The pups are concealed within their dens for 3 weeks after bi

> The sand scorpion is a predator that always hunts from a motionless resting position outside its own burrow. When prey appears on the horizon, within say 20 cm, the scorpion assumes an alert posture; it determines the angular position of the prey, makes

> Models of climate change predict that global temperatures and precipitation will increase in the next 100 years, with the largest changes occurring during winter in northern latitudes. Researchers recently gathered data on the potential effects of climat