# Question about Problem set

Refer to Exhibit 14-1. What value for the missing mean would result in no interaction (SSA x B = 0)?

Exhibit 14-1- Treatment means.

B1 B2

A1 M = 6 M = 8

A2 M = 12 M = ?

2

10

12

14

A Pearson correlation of r = -0.85 indicates that a graph of the data would show __________.

points clustered close to a line that slopes up to the right

points clustered close to a line that slopes down to the right

points widely scattered around a line that slopes up to the right

points widely scattered around a line that slopes down to the right

A set of n = 5 pairs of X and Y values has SX = 10, SY = 20, and SXY = 60. For this set of scores, the value of SP is __________.

-20

-28

20

60

Suppose the correlation between height and weight for adults is +0.80. What proportion (or percent) of the variability in weight can be explained by the relationship with height?

80%

64%

100 - 80 = 20%

40%

For a sample of n = 20 individuals, how large a Pearson correlation is necessary to be sta-tistically significant for a two-tailed test with a = .05?

0.444

0.433

0.423

0.413

A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With a = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test?

7.81

9.49

42.56

43.77

A chi-square test for goodness of fit is used to test whether or not there are any prefer-ences among three brands of cola. If the study uses a sample of n = 60 subjects, then the ex-pected frequency for each category would be __________.

1

15

20

30

A chi-square test for independence has df = 2. What is the total number of categories (cells in the matrix) that were used to classify individuals in the sample?

2

3

4

6

A sample of 100 people is classified by gender (male/female) and by whether or not they are registered voters. The sample consists of 80 females and 20 males, and has a total of 60 regis-tered voters. If these data were used for a chi-square test for independence, the expected frequen-cies should have __________ males who are registered voters.

12

20

40

cannot determine without additional information

Under what conditions can the phi-coefficient be used to measure effect size for a chi-square test for independence?

When both variables consist of exactly two categories

When both variables consist of more than two categories

When either of the two variables consists of exactly two categories

When either of the two variables consists of more than two categories