Questions from Statistics

Q: Suppose that a new nicotine patch to help people quit smoking was

Suppose that a new nicotine patch to help people quit smoking was developed and tested. Smokers voluntarily entered the study and were randomly assigned either the nicotine patch or a placebo patch. S...

Q: Use the data given in exercise 11.35. Follow the

Use the data given in exercise 11.35. Follow the instructions given in exercise 11.43.

Q: In a 2015 study reported in the Journal of American College Health

In a 2015 study reported in the Journal of American College Health, Cho et al. surveyed college students on their use of apps to monitor their exercise and fitness. The data are reported in the table....

Q: In the study referenced in exercise 10.33, researchers also

In the study referenced in exercise 10.33, researchers also collected data on use of apps to monitor diet and calorie intake. The data are reported in the table. Test the hypothesis that diet app use...

Q: A McDonald’s fact sheet says its cones should weigh 3.18

A McDonald’s fact sheet says its cones should weigh 3.18 ounces (converted from grams). Suppose you take a random sample of four cones, and the weights are 4.2, 3.4, 3.9, and 4.4 ounces. Assume that t...

Q: A fast-food chain advertises that the medium size serving of

A fast-food chain advertises that the medium size serving of French fries weighs 135 grams. A reporter took a random sample of 10 medium orders of French fries and weighed each order. The weights (in...

Q: Brain size for 20 random women and 20 random men was obtained

Brain size for 20 random women and 20 random men was obtained and is reported in the table (in hundreds of thousands of pixels shown in an MRI). Test the hypothesis that men tend to have larger brains...

Q: The weights of four randomly and independently selected bags of potatoes labeled

The weights of four randomly and independently selected bags of potatoes labeled 20 pounds were found to be 21.0, 21.5, 20.5, and 21.2 pounds. Assume Normality. a. Find a 95% confidence interval for t...

Q: Elena Lucin, a statistics student, collected the data in the

Elena Lucin, a statistics student, collected the data in the table showing heart rate (beats per minute) for a random sample of coffee drinkers before and 15 minutes after they drank coffee. Carry out...

Q: The final exam grades for a sample of daytime statistics students and

The final exam grades for a sample of daytime statistics students and evening statistics students at one college are reported. The classes had the same instructor, covered the same material, and had s...