Question

The General Social Survey collects data on demographics, education, and work, among many other characteristics of US residents. The histograms below display the distributions of hours worked per week for two education groups: those with and without a college degree.

Suppose we want to estimate the difference between the average number of hours worked per week by all Americans with a college degree and those without a college degree. Summary information for each group is shown in the tables.

Statistic	College Degree	No College Degree
Mean	42.3 hours	39.6 hours
SD	15.5 hours	15.4 hours
n	517	632

1. Create a 95% confidence interval for the difference in number of hours worked between the two groups. Round results to four decimal places.

( ,  )

Answer 1

The statistical software output for this problem is :

A 95% confidence interval for the difference in number of hours worked between the two groups is :

(0.9017 , 4.4983)