The 1996 GSS asked, “How many days in the past seven days have you felt happy?” (This was the most recent year this question was posed.)
a. Using the GSS variable HAPFEEL, verify that the sample had a mean of 5.27 and a standard deviation of 2.05. What was the sample size?
b. Find the standard error for the sample mean.
c. Stating assumptions construct and interpret a 95% confidence interval for the population mean. Can you conclude that the population mean is at least 5.0?