(I have answered 1 a) but I don't understand b) I have given you the table and will provide you with scatter plot with the best fit line) A particular MDM4U class had a large number of absences. Please see the attached data table, which lists each student’s midterm mark and their number of absences over the whole semester. overall absences midterm mark 16 79 4 90 17 72 26 80 22 63 15 78 17 75 2 96 4 84 19 93 12 78 27 70 20 72 22 78 15 84 18 70 7 87 19 66 24 66 26 42 15 84 28 72 10 81 31 24 29 60 0 96 14 81 13 84 6 90 2 93 18 87 4 96 34 30 14 72 On a spreadsheet, perform a linear regression analysis (i.e. draw a best-fit line). Comment on the sign and the strength of the correlation coefficient. Use one sentence to explain its meaning using the variables in this particular context. The sign of the correlation coefficient is negative at -0.7963 the correlation coefficient value show that the two values are strongly correlated if there are more absences then the student will not learn the coarse perfectly and this will result in a bad mark (when one variable increases the other decreases. b) How do we know if this model is a good fit to the data? Then, assuming the model is good enough, Bob has a midterm mark of _____ (pick a two-digit integer). How many Bob’s absences does the model predict?

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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(I have answered 1 a) but I don't understand b) I have given you the table and will provide you with scatter plot with the best fit line)

A particular MDM4U class had a large number of absences. Please see the attached data table, which lists each student’s midterm mark and their number of absences over the whole semester.

overall absences	midterm mark
16	79
4	90
17	72
26	80
22	63
15	78
17	75
2	96
4	84
19	93
12	78
27	70
20	72
22	78
15	84
18	70
7	87
19	66
24	66
26	42
15	84
28	72
10	81
31	24
29	60
0	96
14	81
13	84
6	90
2	93
18	87
4	96
34	30
14	72

On a spreadsheet, perform a linear regression analysis (i.e. draw a best-fit line). Comment on the sign and the strength of the correlation coefficient. Use one sentence to explain its meaning using the variables in this particular context.

The sign of the correlation coefficient is negative at -0.7963

the correlation coefficient value show that the two values are strongly correlated if there are more absences then the student will not learn the coarse perfectly and this will result in a bad mark (when one variable increases the other decreases.

b) How do we know if this model is a good fit to the data? Then, assuming the model is good enough, Bob has a midterm mark of _____ (pick a two-digit integer). How many Bob’s absences does the model predict?