A food bank investigates if the number of times their donors walk by a homeless person each week impacts donors’ charitable contribution to the food bank. The data are presented below in standard form.     # of homeless people seen each week Donation to food bank Donor ZX ZY 1 -1.3 0.36 2 0.64 -0.09 3 -1.1 1.26 4 -0.14 0.14 5 1.41 -0.54 6 -0.52 -0.09 7 1.03 -1.9 8 0.64 -0.99 9 0.83 0.36 10 -1.49 1.49   What does ΣZXZY equal?  A) 941 B) 7.86 C) -7.16 D) -4.44       What is the correlation (Pearson’s r) between the number of homeless people donors see each week and their donation to the food bank (rounded to 2 decimal places)?  A) .98 B) -.80 C) .72 D) -.56     What is the obtained t-value for this r? A) -2.96 B) -16.35 C) -3.72 D) -1.89

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A food bank investigates if the number of times their donors walk by a homeless person each week impacts donors’ charitable contribution to the food bank. The data are presented below in standard form.

 

 

# of homeless people seen each week

Donation to food bank

Donor

ZX

ZY

1

-1.3

0.36

2

0.64

-0.09

3

-1.1

1.26

4

-0.14

0.14

5

1.41

-0.54

6

-0.52

-0.09

7

1.03

-1.9

8

0.64

-0.99

9

0.83

0.36

10

-1.49

1.49

 

What does ΣZXZY equal? 
A) 941
B) 7.86
C) -7.16
D) -4.44

 

 

 

What is the correlation (Pearson’s r) between the number of homeless people donors see each week and their donation to the food bank (rounded to 2 decimal places)? 

A) .98
B) -.80
C) .72
D) -.56

 

 

What is the obtained t-value for this r?

A) -2.96
B) -16.35
C) -3.72
D) -1.89

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