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Question 520:

Your company asks you to compare a new advertising campaign and the old one. Sample data on the accounts as follows:
Old: 40, 28, 35, 38, 31, 42, 26, 44, 29, 43
New: 29, 26, 31, 26, 28, 31, 19, 21, 27, 30

Calculate the mean, median, and mode.
Calculate variance and standard deviation for each set.
Calculate a 95% Confidence Interval for the two sets.

Need help with the concepts in this question ? View the Comparing Two Means: 2 Sample t-test Tutorial.

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