This preview shows page 1. Sign up to view the full content.
Unformatted text preview: . 67 SS y = s ( y 2 )( y ) 2 n = 3623136 9 = 13 . 56 SS x = s ( x 2 )( x ) 2 n = 3773249 9 = 16 . 00 r = SP xy r SS x SS y =. 67 r (16 . 00)(13 . 56) =0.05 Regression: b = SP xy SS x =. 67 16 . 00 =. 04 Y = y n =56 . 00 / 9 =6 . 22 , X = x n =57 . 00 / 9 =6 . 33 a = Y( b )( X ) =6 . 22(. 04)(6 . 33) =6 . 49 Y p = bX + a = Y p =(0.04)(X)+(6.49) Prediction: at x = 4, the prediction for y = (. 04)(4)+6 . 49 =6.32 Standard Error of Prediction: s y  x = R SS y (1r 2 ) n2 = R 13 . 56(1(. 05) 2 ) 92 = 1.39 Note: On the exam you should round all intermediate results to 2 decimal places. However the fnal answers on this key were computed using higher precision, thereFore there may be rounding discrepancies with solutions computed rounding at every step, especially For prediciton....
View
Full
Document
 Fall '08
 Ard

Click to edit the document details