You have estimated the following equation: Test Score - 607.3 +3.85 Income -0.0423 Income2, Testscore is the average of the reading and math scores on the Stanford 9 standardized test administered to sth grade students in 420 California school districts in 1998 and 1999. Income is the average annual per capita income in the school district, measured in thousands of 1998 dollars. The equation:
1. Interpret the model carefully.
2. Find the average income of a family with 4 members that maximize the average Test score.
3. The regression of quadratic model ion of quadratic model yield a significant rise in the R-squares value compare to a single Test score to Income linear model. Explain why.
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You have estimated the following equation: Test Score - 607.3 +3.85 Income -0.0423 Income2, Testscor...
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