Determine the margin of error for a 95% confidence interval for the difference between population means for each of the following (assume equal population variances):

a.

b.

c. The sample sizes in part a are 4 times larger than the sample sizes in part b. Comment on your answers to part a compared to your answers to part b.

Transcribed Image Text:

nx = 100 = 64 ny: 4427 = 36 x = 300 49 y = 320 =