Question: We might expect credit card purchases to differ from cash purchases at the same store. Table P-15 contains daily gross cash sales and number of

We might expect credit card purchases to differ from cash purchases at the same store. Table P-15 contains daily gross cash sales and number of items sold for cash purchases, and daily gross credit card sales and number of items sold for credit card purchases at the same consignment store for 25 consecutive days.

a. Make a scatter diagram of daily gross sales Y versus items sold X for cash purchases. Using a separate plot symbol or color. add daily gross sales and items sold for credit card purchases. Visually compare the relationship between sales and number of items sold for cash with that for credit card purchases.

b. Define the dummy variable?

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