You Wish to Construct a 95% Confidence Interval to Compare

question 44

Multiple Choice

You wish to construct a 95% 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 10,what sample size should we take from each group? Assume equal sample sizes.

• A)49
• B)47
• C)50
• D)48
• E)51

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