djennings8055
01.09.2019 •
Mathematics
What is the r-value of the following data to three decimal places?
x
y
2 15
6 13
7 9
8 8
12 5
a. 0.953
b. -0.953
c. 0.909
d. -0.909
Solved
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Ответ:
Option B
Step-by-step explanation:
Given that two variables in table as
Total Average
x 2 6 7 8 12 35 7
y 15 13 9 8 5 50 10
xy 30 78 63 64 60 295 59
(x-7)^2 25 1 0 1 25 52 10.4
(y-10)^2 25 9 1 4 25 64 12.8
Var x = 10.4 and std dev x = 3.225
Var Y = 12.8 and std dev Y = 3.578
Cov (xy) = E(xy)-E(x) E(Y)=59-70=-11
Correlation coefficient r
= Cov /sx sy = -11/(3.225)(3.578)=-0.9532
Round off to get
r=-0.953
Henceoption B is right.
Ответ:
2- 9xn-8
3- n divided by 4
4- 8-4xn
5- 14+n
6- 7xn-28
7-n divided by 9
8- 10-n
9- nx16
10- n divided by 10
11- 21+n
12- n+15
13- 3xn-1
14- 18-6xn
15- n divided by 12
16- 6+ 6xn
17- 5xn-11
18- n divided by 5
19- nx7
20- 6-nx8
I am not 100% sure this is what it means by writing the given statement in symbols but if it does mean this then these are the answers:)