NARRBEGIN: Promotional Campaigns
Promotional Campaigns
the General Manager of a Chain

NARRBEGIN: Promotional Campaigns
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. $$\begin{array} { | l | c | c | } \hline \text { Day } & \text { Sales During Campaign } & \text { Sales After Campaign } \\\hline \text { Sunday } & 18.1 & 16.6 \\\text { Monday } & 10.0 & 8.8 \\\text { Tuesday } & 9.1 & 8.6 \\\text { Wednesday } & 8.4 & 8.3 \\\text { Thursday } & 10.8 & 10.1 \\\text { Friday } & 13.1 & 12.3 \\\text { Saturday } & 20.8 & 18.9 \\\hline\end{array}$$ NARREND
-Motorcycle insurance appraisers examine motorcycles that have been involved in accidental collisions to assess the cost of repairs. An insurance executive is concerned that different appraisers produce significantly different assessments. In an experiment 10 motorcycles that have recently been involved in accidents were shown to two appraisers. Each assessed the estimated repair costs. These results are shown below. Can the executive conclude at the 5% significance level that the appraisers differ in their assessments?
$$\begin{array} { | c | c c | } \hline \text { Motorcycle } & \text { Appraiser 1 } & \text { Apprai5er 2 } \\\hline 1 & 1650 & 1400 \\2 & 360 & 380 \\3 & 640 & 600 \\4 & 1010 & 920 \\5 & 890 & 930 \\6 & 750 & 650 \\7 & 440 & 410 \\8 & 1210 & 1080 \\9 & 520 & 480 \\10 & 690 & 70 \\\hline\end{array}$$