Do people tend to spend more money on fast-food when they use a credit card? The following
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(a) Draw boxplots of each data set using the same scale. What do the boxplots imply for cash versus credit?
(b) Test whether the sample evidence suggests that people spend more when using a credit card. Use the α = 0.01 level of signiï¬cance.
(c) Suppose that you were looking to gather evidence to convince your manager that an effort needs to be made to boost credit-card sales. Would it be legitimate to change the level to α = 0.05 after seeing the results from part (b)? Why?
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a The fivenumber summaries follow Credit 1035 1389 1755 1916 2389 Minitab 1035 1361 1755 1954 2389 Cash 626 890 1106 1564 2176 Minitab 626 837 1106 16...View the full answer
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