Y = na + b X + b X

X Y = a X + b X + b XX

X Y = a X + b XX +b X

The Outdoor Shop would like to develop an estimating equation for predicting sales of Scouts Brand sleeping bags. They feel that sales of sleeping bags are related to the number of newly registered boy scouts and girl scouts in the community. In the six past years the following data have been compiled:

	X	X	Y
Year	New boy scouts	New girl scouts	Sales (units)
2012	412	120	324
2013	316	126	289
2014	407	132	330
2015	418	189	370
2016	384	156	342
2017	393	207	384

1. Develop the least squares estimating equation:

Y	X	X	X Y	X Y	XX	X	X	Y

In the fall of 2018, 312 new boy scouts have registered in the city's troops and 205 girl scouts have registered. How many sleeping bags should the Outdoor Shop expect to sell this year?