Questions from Statistics

Q: Assume that you want to construct a 95% confidence interval to

Assume that you want to construct a 95% confidence interval to estimate a population mean. Find the minimum sample size needed to obtain the specified margin of error for the 95% confidence interval....

Q: Nielsen Media Research uses samples of 5000 households to rank TV shows

Nielsen Media Research uses samples of 5000 households to rank TV shows. Nielsen reported that 60 Minutes had 15% of the TV audience. What is the 95% confidence interval for this result?

Q: Repeat Exercise 21 assuming that the sample size is doubled to 10

Repeat Exercise 21 assuming that the sample size is doubled to 10,000. Given that the large cost and effort of conducting the Nielsen survey would be doubled, does this increase in sample size appear...

Q: A study done by researchers at Alfred University concluded that 80%

A study done by researchers at Alfred University concluded that 80% of all student athletes in this country have been subjected to some form of hazing. The study is based on responses from 1400 athlet...

Q: In a study of the accuracy of order filling at fast food

In a study of the accuracy of order filling at fast food drive through, McDonald’s had 33 orders that were not accurately filled among 362 orders observed (based on data from QSR magazine). Calculate...

Q: In a Gallup poll of 1059 adults, the interview subjects were

In a Gallup poll of 1059 adults, the interview subjects were selected by using a computer to randomly generate telephone numbers (both land lines and cell phones) that were then called.

Q: The Genetics and IVF Institute conducted clinical trials of the YSORT method

The Genetics and IVF Institute conducted clinical trials of the YSORT method designed to increase the probability of conceiving a boy. Among 152 babies born to parents using the YSORT method, 127 were...

Q: A Pew Research Center poll surveyed 1708 randomly selected adults who were

A Pew Research Center poll surveyed 1708 randomly selected adults who were asked whether “global warming is a problem that requires immediate government action.” Results showed that 939 of those surve...

Q: A study by Stanford University researchers for the Office of National Drug

A study by Stanford University researchers for the Office of National Drug Control Policy and the Department of Health and Human Services concluded that 98% of the top rental films involve drugs, drin...

Q: The following table lists labor force participation rates (as percentages)

The following table lists labor force participation rates (as percentages) of mothers, categorized according to the age of their youngest child (based on data from the Bureau of Labor Statistics).