6. In a frequency distribution, the lowest score is 35 and the highest is 50; the mean is 17. The range is:

Select one:

a.

11

b.

15

c.

24

d.

33

7. In a linear regression, the error introduced by the predictions based on the regression line is called:

Select one:

a.

slope

b.

intercept

c.

residual

d.

correlation ratio

8. Before choosing a statistical test to compare a mean score between two groups, which of the following needs to be considered?

Select one:

a.

Distribution of the outcome measure

b.

Independence of groups being compared

c.

Sample size

d.

Parametric versus non parametric methods

e.

All of the above are correct.

9. In the following frequency distribution 4, 4.1, 4, 5, 5.3, 5.6, 7, 13, the number 4.1 is the:

Select one:

a.

mode

b.

median

c.

range

d.

mean

e.

none of the above

10. The mean and the standard deviation of a frequency distribution that follows a normal distribution are 20 and 5, respectively. Ninety-five percent of the scores will fall between:

Select one:

a.

5 and 40

b.

15 and 25

c.

17.5 and 25.5

d.

10 and 30