Consider the following sample data:

46 51 28 55 29 53 47 36 40 48 29 44 30 58 60 29 13 28 24 11 28 28 29 14

a. Find the sample regression equation,ŷ= b0 + b1x1 + b2x2.

b. C onstruct a 95% confidence interval fo r E(y ) if x 1 equals 50 and x2 equals 20.

c. C onstruct a 95% prediction interval fo r y if x 1 equals 50 and x2 equals 20.

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