Promotional Campaigns the General Manager of a Chain of Fast

Essay

Promotional Campaigns The general manager of a chain of fast food chicken restaurants wants to determine how effective their promotional campaigns are. In these campaigns "20% off" coupons are widely distributed. These coupons are only valid for one week. To examine their effectiveness, the executive records the daily gross sales (in $1,000s)in one restaurant during the campaign and during the week after the campaign ends. The data is shown below.
Day Sales During Campaign Sales After Campaign {Promotional Campaigns Narrative} Can they infer at the 5% significance level that sales increase during the campaign?