SOLUTION: you are given the following data number of absences 0 1 2 2 3

Question 322483: you are given the following data
number of absences
0
1
2
2
3
3
4
5
6

final grade
96
92
71
71
78
66
60
51
42

make a scatter plot for the data;
find the correlation coefficient for the data
find the equation for the regression line for the data, and predict the final grade of the student who misses 3.5 days
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!


On your TI-83 or TI-84

Press ON
Press CLEAR
Press 2ND
Press 0  (zero)
Press x^-1
Press down arrow 9 times to scroll to DiagnosticOn
Press ENTER  (read DiagnosticOn
Press ENTER  (read Done

Press CLEAR
Press STAT
Press 1
(enter the data for the number of absences in L1
(enter the data for the final grades in L2

Press 2ND
Press Y=
Press ENTER
Press ENTER (again)

Press STAT
Press right arrow >
Press 4    
(you'll see LinRed(ax+b)

Press VARS
Press right arrow >
Press ENTER
Press ENTER again

See this:
LinReg
 y=ax+b
 a=-8.873076923
 b=95.3
 r�=.9149096479
 r=-.9565090945 

That means the regression line is y = -8.873076923x + 95.3
and the correlation coefficient is  r=.9565090945

To see the scatter plot and the regression line:

Press ZOOM
Press 9 

Edwin

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