Question

Say x = how many cups of coffee a person had yesterday and y = how...

Say x = how many cups of coffee a person had yesterday and y = how many cups of coffee a person had today. Say a sample of three people results in the data pairs

x y

1 3

2 2

3 1

What is the sample correlation of x and y?

Math   Statistics-And-Probability   
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Answer #1

X= cups of coffee a person had yesterday

Y= cups of coffee a person had today

1

3

-1

1

-1

1

1

2

2

0

0

0

0

0

3

1

1

-1

-1

1

1

Total

6

6

0

0

-2

2

2

mean

2

2

The coefficient of correlation between two variables can be obtained by

Hence the sample correlation coefficient between x and y is -1.

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