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The following data describes weekly gross revenue, television advertising, and newspaper advertising for Showtime Movie Theat

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X2-MX2 -1.341 1.722 1.813 - 1.188 0.813 -0.688 -0.188 0.313 -0.688 -0.188 -0.975 -0.475 -0.975 0.025 0.825 -0.175 1.725 0.025

Sum of X1 = 25.5
Sum of X2 = 19.8
Sum of Y = 749
Mean X1 = 3.1875
Mean X2 = 2.475
Mean Y = 93.625
Sum of squares (SSX1) = 6.4688
Sum of squares (SSX2) = 5.815
Sum of products (SPX1Y) = 8.5625
Sum of products (SPX2Y) = 0.725
Sum of products (SPX1X2) = -3.4125

Regression Equation = ŷ = b1X1 + b2X2 + a

b1 = ((SPX1Y)*(SSX2)-(SPX1X2)*(SPX2Y)) / ((SSX1)*(SSX2)-(SPX1X2)*(SPX1X2)) = 52.27/25.97 = 2.01

b2 = ((SPX2Y)*(SSX1)-(SPX1X2)*(SPX1Y)) / ((SSX1)*(SSX2)-(SPX1X2)*(SPX1X2)) = 33.91/25.97 = 1.31

a = MY - b1MX1 - b2MX2 = 93.63 - (2.01*3.19) - (1.31*2.48) = 83.98

ŷ = 2.01X1 + 1.31X2 + 83.98

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