Question

A retail analyst wants to determine whether the average purchase amount differs between customers who received an email coupon and those who did not. Each group contains about 200 customers, the purchase amounts are roughly normally distributed, and the analyst wants to know if the observed difference in group means is statistically significant. Which statistical method is most appropriate?

Accepted Answer

An independent-samples t-test comparing the two group means

Answer

A chi-square test of independence on the raw purchase amounts

Answer

A simple linear regression predicting purchase amount from customer ID

Answer

A paired t-test comparing each customer's before and after values