Essay
The computer output for a multiple regression analysis including 15 observations and three predictor variables,
and
, provides the following information:
,
,
,
, SE
, SE
, and SE
a. Which, if any, of the independent variables
and
contribute information for the prediction of y?
b. Give the least-squares prediction equation.
c. What is the practical interpretation of the parameter 
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a. The hypotheses of interest are
vs.
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