Posted by **Bonnie** on Tuesday, March 5, 2013 at 9:00pm.

below is the sales experience(in months) and the number of computers sold the the previous month of seven sales people.

Experience 4 12 9 6 10 30 7

Sales 19 42 28 31 39 30 21

Using the Minitab info write the straight line(least squares) equation and the correlation coefficent.

The regression equation is:

sales=27.2+0.252 exp

Predictor Coef SECoef T P

Constant 27.195 5.781 4.70 0.005

Exp. 0.2517 0.4201 0.60 0.575

S=8.97833 R-sq=6.7%

- stats -
**MathGuru**, Wednesday, March 6, 2013 at 6:13pm
I ran your data through an online calculator and the regression equation looks correct. See below:

7 data pairs (x,y):

( 4.00 , 19.0 ); ( 12.0 , 42.0 ); ( 9.00 , 28.0 ); ( 6.00 , 31.0 ); ( 10.0 , 39.0 ); ( 30.0 , 30.0 ); ( 7.00 , 21.0 );

y = a + bx where:

a= 27.2

b= 0.252

Correlation coefficient:

r = 0.259 (p = 0.575)

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