Homework Soursehttpedugenwileypluscomedugenltimainuni Chapter 8 Quiz Chapte
http://edugen.wileyplus.com/edugen/lti/main.uni
Chapter 8 Quiz
*Chapter 08, Section 8.3, Problem 040c
Find the value of t for the t distribution for the following.
Area in the left tail = 0.005 and n = 27 .
Enter the exact answer.
*Chapter 08, Section 8.3, Problem 064
A random sample of 34 participants in a Zumba dance class had their heart rates measured before and after a moderate 10-minute workout. The following data correspond to the increase in each individual’s heart rate (in beats per minute):
*Chapter 08, Section 8.4, Problem 084
*Chapter 08, Section 8.4, Problem 090
A researcher wanted to know the percentage of judges who are in favor of the death penalty. He took a random sample of 15 judges and asked them whether or not they favor the death penalty. The responses of these judges are given here.
*Chapter 08, Supplementary Exercises, Problem 106
A survey of 20 randomly selected adult men showed that the mean time they spend per week watching sports on television is 7.39 hours with a standard deviation of 1.37 hours.
*Chapter 08, Supplementary Exercises, Problem 114
A researcher wants to determine a 99% confidence interval for the mean number of hours that adults spend per week doing community service.
How large a sample should the researcher select so that the estimate is within 1.2 hours of the population mean? Assume that the standard deviation for time spent per week doing community service by all adults is 3 hours.
Solution
*Chapter 08, Section 8.3, Problem 040c
t = -2.77068
mean = 52.85
95% CI = (49.22, 56.49)
