A large school district is reevaluating its teachers' salaries. They have decided to use regression analysis to predict mean teacher salaries at each elementary school
The researcher would like to examine the significance of the following quadratic model for predicting salary based on years of experience.
Y = ?0 + ?1X1 + ?2X2 + ? where X1 = Yrs Exp and X2 = Yrs Exp2
Salary Yrs Exp
$24,265.00 8
$27,140.00 5
$22,195.00 2
$37,950.00 15
$32,890.00 11
$40,250.00 14
$36,800.00 9
$30,820.00 6
$44,390.00 21
$24,955.00 2
$18,055.00 1
$23,690.00 7
$48,070.00 20
$42,205.00 16
(a) What is the adjusted r2?
(b) What is the prediction equation?
(a) 0.855
(b) Y = 19015.29 + 1437.49X1 - 4.98 X2
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