Deck 15: Testing for Association: Phi

Question 1

Assumptions made by the Phi statistic include

A)normal distributions
B)equal variances
C)variables are natural dichotomies
D)all of the above

Answer 1

C

Question 2

Any variable that can be split into two equal parts is,by definition,a natural dichotomy.

Answer 2

False

Question 3

Under which of these circumstances would you prefer NOT to use Phi?

A)the number of cases is large
B)the relationship is small
C)the coefficient produces a value less than .50
D)the table marginals are very different

Answer 3

D

Question 4

One of the reasons that Phi is a popular statistic is that it has both symmetric and asymmetric versions.

Question 5

Phi is based on an inferential statistic; that statistics is

A)Analysis of Variance
B)t-test
C)Chi-square
D)Fisher's Exact Test

Question 6

If you explained 25% of the variance in the dependent variable using the Phi statistic,what would the Phi coefficient be?

A).25
B).40
C).50
D)none of the above

Question 7

If a two-variable table creates problems for Chi-square,there will also be problems with Phi.

Question 8

There are alternatives to the use of Phi; two of them are:

A)Gamma and Lambda
B)Uncertainty Coefficient and Spearman's Rho
C)Chronbach's Alpha and McNemar's Q
D)none of the above

Question 9

Correlation coefficients for Phi range between zero and 1.0.

Question 10

You can't tell the direction of a relationship by looking only at its Phi coefficient.

Question 11

The nominal-level concept of association is that

A)as the number of cases in the table cells of one of the values increases,the corresponding number should decrease in cells of the other values
B)as the number of cells in the row of the independent variable increases,the corresponding number of cells should decrease in cells of the other rows

Question 12

Phi is sensitive to unequal marginal distributions.

Question 13

A Phi coefficient of .6 means that the percent of explained variance is 36%.

Question 14

Phi is designed to be used with square tables.

Question 15

A Phi value of .40 would be interpreted as having explained

A)4% of the variance in the dependent variable
B)40% of the variance in the dependent variable
C)1.6% of the variance in the dependent variable
D)16% of the variance in the dependent variable

Question 16

The Uncertainty Coefficient is possible statistic to use with nominal level variables when there are serious table problems.

Question 17

Phi is a correlation statistic for which level of measurement below?

A)nominal
B)ordinal
C)interval
D)nominal and ordinal

Question 18

Smaller tables,on the whole,are easier to interpret at the nominal level than larger tables.

Question 19

Which of the variables below would be interpreted as a natural dichotomy?

A)age measured by "young" and "old"
B)gender measured by "male" and "female"
C)income measured by "low" and "high"
D)type of crime measured by "nonserious" and "serious"