Tute 6

It is unsuitable or inadvisable to use Pearson’s r when:

• a. a.the relationship is linear

• b. the relationship is non-linear

• c. there are no extreme scores or outliers

• d. both variables have been measured on a ratio scale

• e. both variables have been measured on an interval scale

Which of the following statements does NOT apply to Pearson’s r?

• a. It is not sufficient to establish causal links between variables

• b. Is not sensitive to curvilinear relationships.

• c. It is the square root of the coefficient of determination

• d. It is a measure of the extent to which paired scores occupy the same or opposite positions within their distributions

• e. It is relatively insensitive to outliers

Which of the following scatterplots of X and Y scores would yield the highest absolute value (i.e., ignoring the + or - sign) of Pearson’s r?

• a. 1

• b. 2

• c. 3

• d. 4

• e. 5

•The value of Pearson’s r for scatterplot 1 would be approximately:

• a.+0.50

• b. -0.50

• c. +1.00

• d. 0.00

• e. -1.00

•The value of Pearson’s r for scatterplot 5 would be approximately:

• a. +0.50

• b. -0.50

• c. +1.00

• d. 0.00

• e. -1.00

Which of the following scatterplots would best represent the relationship between a person’s intelligence and the number (1 to 31) of the day of the month of their birth?

• a. 1

• b. 2

• c. 3

• d. 4

• e. 5

Which of the relationships shown are negative relationships?

• a. 2 & 4

• b. 4 & 5

• c. 3 & 5

• d. 3 & 4

• e. 1 & 2

•If the correlation between two variables, X and Y, is r = -0.9, then this means that:

• a. values above the mean on X pair with values below the mean on  Y

• b. 81% of the variance in Y is related to the variance in X and 81% of the variance in X is related to the variance in Y

• c. the data points will cluster closely along a straight line

• d. the slope of the ‘line of best fit’ is negative

• e. all of the above

With a correlation of + .60 between two variables, the percentage of unshared variance would be:

• a. 30%

• b. 36%

• c. 40%

• d. 60%

• e. 64%