Questions from Statistics Principles

Q: A physical therapist wants to determine the difference in the proportion of

A physical therapist wants to determine the difference in the proportion of men and women who participate in regular, sustained physical activity. What sample size should be obtained if she wishes the...

Q: An educator wants to determine the difference between the proportion of males

An educator wants to determine the difference between the proportion of males and females who have completed four or more years of college. What sample size should be obtained if she wishes the estima...

Q: Stock fund managers are investment professionals who decide which stocks should be

Stock fund managers are investment professionals who decide which stocks should be part of a portfolio. In an article in the Wall Street Journal (“Not a Stock-Picker’s Market,” WSJ, January 25, 2014),...

Q: Consider the following two questions: (a) Do you

Consider the following two questions: (a) Do you believe that the government should or should not be allowed to prohibit individuals from expressing their religious beliefs at their place of employmen...

Q: On April 12, 1955, Dr. Jonas Salk released the

On April 12, 1955, Dr. Jonas Salk released the results of clinical trials for his vaccine to prevent polio. In these clinical trials, 400,000 children were randomly divided in two groups. The subjects...

Q: Why do we use a pooled estimate of the population proportion when

Why do we use a pooled estimate of the population proportion when testing a hypothesis about two proportions? Why do we not use a pooled estimate of the population proportion when constructing a confi...

Q: Explain the difference between an independent and dependent sample

Explain the difference between an independent and dependent sample

Q: A sampling method is ______ when the individuals selected for one

A sampling method is ______ when the individuals selected for one sample do not dictate which individuals are selected to be in a second sample.

Q: A sampling method is _____ when the individuals selected for one

A sampling method is _____ when the individuals selected for one sample are used to determine the individuals in the second sample.

Q: A sociologist wishes to compare the annual salaries of married couples in

A sociologist wishes to compare the annual salaries of married couples in which both spouses work and determines each spouse’s annual salary.