straight line equations and correlation coefficent

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Sue0113

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Using the following Minitab output write the straight line (least squares) equation and
the correlation coefficient.

The regression equation is
Sales = 27.2 + 0.252 Exp

Predictor Coef SE Coef 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%
I need to plot a regression line Two points are needed. Give calculations
Can someone help with this or at least direct me to a website that would explain it better than my textbook.
 
which book are you using??

Sue0113 said:
Using the following Minitab output write the straight line (least squares) equation and
the correlation coefficient.

The regression equation is
Sales = 27.2 + 0.252 Exp

Predictor Coef SE Coef 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%
I need to plot a regression line Two points are needed. Give calculations
Can someone help with this or at least direct me to a website that would explain it better than my textbook.
Click to expand...
 
Textbook

Stats Data and Models 3rd edition by Deveaux, Velleman and Bock
 
Sue0113 said:
Using the following Minitab output write the straight line (least squares) equation and
the correlation coefficient.

The regression equation is
Sales = 27.2 + 0.252 Exp

Predictor Coef SE Coef 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%
I need to plot a regression line Two points are needed. Give calculations
Can someone help with this or at least direct me to a website that would explain it better than my textbook.
Click to expand...
A regression line is a STRAIGHT line.

As indicated, we need only two points to plot a straight line. Your equation is sufficient to give you an infinite number of points.

If exp = 0, sales = 27.2. If exp = 100, sales = 27.2 + 25.2 = 52.4. So two eaily calculated points are (0, 27.2) and (100, 52.4). Now connect them by a straight line. that goes past 100.
 
Last edited:
not in textbook

Question is on an assignment. I just want to know how to write a straight line equation and the correlation coefficient.
 
Jeff this will not work

The graph does not go to 100. Only goes to 50 on X axis and 40 on y axis. I need to know how to calculate.
 
Sue0113 said:
Using the following Minitab output write the straight line (least squares) equation and
the correlation coefficient.

The regression equation is
Sales = 27.2 + 0.252 Exp

Predictor Coef SE Coef 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%
I need to plot a regression line Two points are needed. Give calculations
Can someone help with this or at least direct me to a website that would explain it better than my textbook.
Click to expand...
The "regression equation" is the equation of the line you need to plot. Choose any two valeues for Exp, such as 0 and 50, and use that linear equation to find Sales.
 
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