QUESTION 1

On a standardized IQ (intelligence quotient) test, the average score is 100 and the standard deviation is 15. According to the empirical rule, 95% of everyone who takes the test should have scores between

70 130

85 115

55 145

100 130

QUESTION 2

Can a frequency distribution have overlapping classes?

Sometimes

No

Yes

Cannot be determined, more information is needed.

QUESTION 3

When we compare two independent samples, n (1) = 15 and n (2) = 11, then the degrees of freedom that are used in the Student's t-distribution will be

26

25

24

13