Sp98ex2

Sp98ex2 - Sp 98 EGN 3420 Exam 2 Name_ DO ANY THREE...

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Sp 98 EGN 3420 Exam 2 Name____________________ DO ANY THREE PROBLEMS! NO SCRATCH WORK DONE ON PROBLEM PAGES ! ALL WORK DONE ON WORK SHEETS ! Check the 3 problems you want graded. 1 40 pts 2 35 pts 3 30 pts 4 25 pts
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(40 pts) A) Annual incomes ( I ) of individuals (after ten years of employment) and their years of education ( N ) are tabulated below. Label the additional columns and fill in the table with the values needed to find the normal equations for determining a 0 , a 1 and a 2 , the coefficients of the least squares quadratic. All numbers should be rounded to 4 places after the decimal point. Least Squares Quadratic: 2 0 1 2 ˆ I a a N a N = + + i N i I i 2 i N 3 i N 4 i N i i N I 2 i i N I 1 0 12 2 5 24 3 8 33 4 11 50 5 16 84 6 22 125 B) Solve the normal equations to find a 0 , a 1 and a 2 . You may use your calculator. Ans. a 0 = __________, a 1 = __________, a 2 = __________ C) Fill in the table below to find the coefficient of determination r 2 . i
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Sp98ex2 - Sp 98 EGN 3420 Exam 2 Name_ DO ANY THREE...

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