tylerb2001
Answered

Mrs. Blair believes there is a relationship between the number of minutes students study and their test grades. She asked her history class to list the number of minutes they studied and their test grade. Using the information provided draw a scatterplot. What test grade might a student expect if they studied approximately 95 minutes?

X + Y

A60
B80
C100
D120

Minutes Studying Test Grade

20 65

22 65

25 50

25 52

30 55

30 68

45 70

45 69

60 75

75 80

90 78

90 83

90 85

100 88

100 78

110 95

120 96

120 100

150 91

150 85

160 82

180 80

180 80

Verified Answer :

natasha13

the answers b) 80 I think

Answer:

B) 80  

Step-by-step explanation:

In the figure attached, the scatter plot is shown.

If you make a linear regression of data (I made it Excel, you can also use a calculator) you will get the following equation:

y = 0.1893x + 60.355

where y is Test grade and x is Minutes studying. Replacing with x = 95, we get:

0.189395 + 60.355 ≈ 80

View image jbiain

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