Im in desperate need and im stuck: Can someone plsease tell me where im going wrong with this question.
Calculate the sample correlation between test score and assembly time.
Test Score Assembly Time
(minutes)
(x) (y)
40 16
50 14
60 12
75 10
80 8
85 10
90 7
-----------------------------------
540 77
MY WORK:
X^2=1600,2500,3600,5625,6400,7225,8100=35050
y^2=256,196,144,100,64,100,49=909
X*Y=640,700,720,750,640,850,630=4930
ss(xy)=4930-(540*77/7)=-1010
ss(x)=35050-(291600/7)=-6607.142
ss(y)=909-(5929/7)=62
Correlation Coefficient is:
r=-1010/(square root of -6607.142 * 62)=???????
This is where i get stuck. Everytime i try to calculate the answer i come up with an error. Can someone pls tell me if i did this correctly. I cant seem to get the answer to the coefficient
Calculate the sample correlation between test score and assembly time.
Test Score Assembly Time
(minutes)
(x) (y)
40 16
50 14
60 12
75 10
80 8
85 10
90 7
-----------------------------------
540 77
MY WORK:
X^2=1600,2500,3600,5625,6400,7225,8100=35050
y^2=256,196,144,100,64,100,49=909
X*Y=640,700,720,750,640,850,630=4930
ss(xy)=4930-(540*77/7)=-1010
ss(x)=35050-(291600/7)=-6607.142
ss(y)=909-(5929/7)=62
Correlation Coefficient is:
r=-1010/(square root of -6607.142 * 62)=???????
This is where i get stuck. Everytime i try to calculate the answer i come up with an error. Can someone pls tell me if i did this correctly. I cant seem to get the answer to the coefficient