### Perform a linear regression that relates bar sales to guests

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The following data relate the sales figures of the bar in Mark Kaltenbach's small bed-and-breakfast inn in Portand, to the number of guests registered that week:

 Week Guest Bar Sales 1 16 \$330 2 12 270 3 18 380 4 14 300

a) Perform a linear regression that relates bar sales to guests (not to time).

b) If the forecast is for 20 guests next week, what are the sales expected to be?

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