# Question: When the 127 workers aged 18 25 in the 2008 GSS

When the 127 workers aged 18–25 in the 2008 GSS were asked how many hours they worked in the previous week, the mean was 37.47 with a standard deviation of 13.63. Does this suggest that the population mean work week for this age group differs from 40 hours? Answer by:

a. Identifying the relevant variable and parameter.

b. Stating null and alternative hypotheses.

c. Finding and interpreting the test statistic value.

d. Reporting and interpreting the P-value and stating the conclusion in context.

a. Identifying the relevant variable and parameter.

b. Stating null and alternative hypotheses.

c. Finding and interpreting the test statistic value.

d. Reporting and interpreting the P-value and stating the conclusion in context.

**View Solution:**## Answer to relevant Questions

An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on the average, into a neighboring lake. An environmental action group decides to monitor the plant, in case this limit is being ...Refer to the previous exercise. a. Explain how the result of the 95% confidence interval shown in the table agrees with the test decision using the 0.05 significance level. b. Suppose you instead wanted to perform a ...Example 8 tested a therapy for anorexia, using hypotheses H0: μ = 0 and Ha: μ ≠ 0 about the population mean weight change μ. In the words of that example, what would be (a) A Type I error and (b) A Type II error? Two researchers conduct separate studies to test H0: p = 0.50 against Ha: p ≠ 0.50, each with n = 400. a. Researcher A gets 220 observations in the category of interest, and p̂ = 220/400 = 0.550 and test statistic z = ...For testing H0: p = 1 / 3 (astrologers randomly guessing) against Ha: p > 1 / 3 with n = 116, Example 13 showed that P(Type II error) = 0.02 when p = 0.50. Now suppose that p = 0.35. Recall that P(Type I error) = 0.05. a. ...Post your question