The following data are from matched samples taken from two populations
Element Population 1 Population 2
1 11 8
2 7 8
3 9 6
4 12 7
5 13 10
6 15 15
7 15 14
a. Provide a 95% confidence interval for the difference between the two population means.
b. Compare the means of population 1 and population 2. Are they equal? Show your test procedure.