Question 1

What is the range of the correlation coefficient?

Accepted Answer

[-1; 1]

Answer

[0; 1]

Answer

(-∞; +∞)

Answer

[0; 100]

Question 2

What relationships can Pearson correlation describe?

Accepted Answer

Linear relationships

Answer

Any relationships

Answer

Non-linear relationships

Answer

Any bivariate relationships

Question 3

What can be inferred from the plot (plot by Tyler Vigen)?

Accepted Answer

Neither statement is true

Answer

Mozzarella cheese stimulates civil engineering research

Answer

Both statements are true

Answer

Civil engineers love mozzarella cheese

Question 4

Is a correlation of 1 always significant?

Accepted Answer

Depends

Answer

Yes

Answer

I don't know

Answer

No

Question 5

What does correlation coefficient NOT correlate with?

Accepted Answer

Sample size

Answer

Covariance

Answer

It correlates with all 3 options

Answer

Standard deviations of the variables

Question 6

In what situation would you want to use a regression rather than a correlation coefficient?

Accepted Answer

When there is a non-zero intercept in the relationship between the variables you are comparing

Answer

When the relationship between the two variables is nonlinear

Answer

When you have a very small dataset

Answer

When you have a very large dataset

Question 7

Which of these measures of correlation is NOT based on ranked data?

Accepted Answer

Pearson

Answer

Kendall

Answer

Spearman

Answer

All three are based on ranked data

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