You Wish to Construct a 90% Confidence Interval to Compare

question 41

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 20 and 30 for Group 1 and Group 2,respectively.If we wish to obtain a margin of error of at most 5,what sample size should we take from each group? Assume equal sample sizes.

• A)141
• B)139
• C)143
• D)140
• E)142

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