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.