Correlation Properties

Which of the following is not a valid value for correlation?

• r = 0.26

• r = 0

• r = -0.99

• r = -1.05

What happens to the correlation if you swap the explanatory and response variables?

• The correlation goes from positive to negative.

• Nothing, because correlation doesn't depend on the order of the variables.

• The new correlation is the reciprocal of the original correlation.

• The new correlation has no relationship to the original correlation.

Which sentence describes the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase.

• As the temperature increases, the number of visitors increases.

• As the visitors increase, the temperature decreases.

• No correlation

As shown in the table, a person's target heart rate during exercise changes as the person gets older. Find the correlation coefficient (r).

• -0.999

• -0.664

• 0.998

• 1.503

Which of the following statements is true?

• The correlation coefficient and the slope of the regression line may have opposite signs.

• A correlation of 1 indicates a strong relationship between the variables.

• Correlations of +0.87 and -0.87 indicate the same degree of clustering around the regression line.

• A correlation of 0 shows little or no association between two variables.

The correlation coefficient is a number "r" such that: 

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1

Determine the correlation coefficient of the given data.

• - .5477

• .1770

• .8956

• - .9463

What type of correlation does this graph have?

• positive

• negative

• none

• all of the above

As x increases, y increases

• correlation coefficient

• causation

• positive correlation

• negative correlation

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D