Crossroad Inn is a small bed-and-breakfast inn. Following table shows the weekly bar sales and number of guests registered for the same week. The manager assumes the bar sales are related to the number of registered guests. Week Guests Bar Sales 1 50 $2,550 2 45 $2,475 3 33 $2,295 4 40 $2,400 5 60 $2,700 6 30 $2,250 7 52 $2,580 a) Develop a simple linear regression model that relates bar sales to guests (not to time). b) If the forecast for 8th week is 55 guests, how much bar sales can be expected?