Average years of education are reported by social class based on the data below. Use the table below to answer the following two questions.
Mean Standard Deviation N
Lower class 12.19 3.08
102
Working class 13.16 2.93
523
Middle class 14.60 2.88
Upper class 15.21 3.01
498
34
Question 4. Construct the 95% confidence interval for the mean number of years of education for lower-class respondents.
Question 5. Construct the 99% confidence interval for the mean number of years of education for lower-class respondents.