You Wish to Construct a 90% Confidence Interval to Compare

Multiple Choice

You wish to construct a 90% confidence interval to compare the mean measurement for two groups.A small pilot study yields sample standard deviations of 10 and 15 for Group 1 and Group 2,respectively.If we wish to obtain a margin of error of at most 3,what sample size should we take from each group? Assume equal sample sizes.

A) 99
B) 96
C) 97
D) 100
E) 98