Test of mean
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An owner of a fast food restaurant reported to corporate headquarters that the average bill paid by his customers in the last quarter was $6.20 and that the standard deviation was $1.90. Not knowing exactly what the effect would be, headquarters suddenly launched a nationwide promotional campaign featuring a large quantity discount for a multi-sandwich purchase. The stubs from the next 81 purchases at the owner's franchise after the campaign was launched average $6.65
a) Set up the null and alternative hypotheses to test if the amount of the average bill at the franchise changed after corporate headquarters launched the promotional campaign.
b) Test your hypothesis using (the Greek letter) a=0.05
c) Based on the results of the study after the promotional campaign, what can you conclude?
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