CAN YOU CHECK THIS OVER AND SEE IF I GOT THEM RIGHT IF NOT PLEASE HELP! Use the
ID: 3130751 • Letter: C
Question
CAN YOU CHECK THIS OVER AND SEE IF I GOT THEM RIGHT IF NOT PLEASE HELP!
Use the SPSS data for this problem. The data represent the scores of some students on two tests. Make a scatterplot of the data (however, you don’t need to include it when you turn in your assignment). A. Is the relation linear or nonlinear? Is it perfect or imperfect? Is it positive or negative? B. What is the value of the correlation coefficient between the scores for each student on the first and second exams? C. What is the equation of the best-fit line when you try to predict a student’s score on the second test (Y) by looking at their score on the first test (X)? D. What would you predict as a student’s score on the second test if that student scored a 75 on the first test? What would you predict as a student’s score on the second test if that student scored an 88 on the first test? (Do these by hand – show you work, and round each answer to the nearest whole number.)
SPSS DATA
LEFT EXAM 1 /RIGHT EXAM 2
1)93 97
2)93 95
3)93 98
4)92 89
5)91 96
6)90 96
7)89 95
8)78 94
9)88 88
10)83 93
11)83 95
12)82 92
13)81 92
14)78 88
15)76 94
16)76 91
17)76 90
18)75 89
19)66 85
20)72 88
21)71 88
22)70 79
23)67 85
24)67 84
25)65 86
26)63 83
27)62 90
28)61 82
29)60 82
30)58 79
31)68 87
32)59 80
33)88 95
34)75 85
35)76 85
36)74 86
37)80 87 38)75 90
B- |r| =.826 Exam 2 dependent variable. On the Y axis
Explanation / Answer
It is an imperfect linear Positive relation since all the points do not lie on the straight line.
R = 0.826
The equation of best fit is
Y = -73.03 + 1.68x
If X = 75
Y = -73.03 + (1.68 × 75)
= 52.97
If X = 88
Y = -73.03 + 1.68(88) = 74.81
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