Questions from Statistics Principles

Q: Design an experiment where the goal is to determine whether people prefer

Design an experiment where the goal is to determine whether people prefer Coke or Pepsi. In the design, be sure to identify the response variable, the role of blinding, and randomization.

Q: A researcher wants to estimate the difference between the percentage of individuals

A researcher wants to estimate the difference between the percentage of individuals without a high school diploma who smoke and the percentage of individuals with bachelor’s degrees who smoke. What sa...

Q: It is commonplace to gain weight after quitting smoking. To determine

It is commonplace to gain weight after quitting smoking. To determine the effectiveness of the drug Naltrexone in limiting weight gain after quitting smoking, 147 subjects who smoked 20 or more cigare...

Q: A prison warden wants to know if men receive longer sentences for

A prison warden wants to know if men receive longer sentences for crimes than women. He randomly samples 30 men and matches them with 30 women by type of crime committed and records their lengths o...

Q: / (a) Compute /for each pair of data

(a) Compute /for each pair of data. (b) Compute /. (c) Test the hypothesis that /level of significance. (d) Compute a 95% confidence interval for the population mean difference /

Q: / (a) Test the hypothesis that / level of

(a) Test the hypothesis that / level of significance for the given sample data. (b) Construct a 95% confidence interval for /

Q: / Test the hypothesis that /level of significance for the

Test the hypothesis that /level of significance for the given sample data.

Q: A random sample of n1 = 650 individuals results in x1 =

A random sample of n1 = 650 individuals results in x1 = 156 successes. An independent sample of n2 = 550 individuals results in x2 = 143 successes. Does this represent sufficient evidence to conclude...

Q: A researcher wants to know whether the acidity of rain (pH

A researcher wants to know whether the acidity of rain (pH) near Houston, Texas, is significantly different from that near Chicago, Illinois. He randomly selects 12 rain dates in Texas and 14 rain dat...

Q: In a study conducted to determine the role that sleep disorders play

In a study conducted to determine the role that sleep disorders play in academic performance, researcher Jane Gaultney conducted a survey of 1845 college students to determine if they had a sleep diso...