The document describes a test of a brand manager's claim about a sales increase following an advertising campaign. Fifteen cities were chosen for a pilot test that collected pre- and post-advertising sales data. The brand manager claims sales increased by 50% more than twice the pre-advertising sales. The document provides data on the daily output of two and three machines and outlines a null hypothesis test to evaluate whether the sales increase claim can be rejected at the 0.05 significance level.