PSY 3204 Chi-square is used to test differences between

| March 14, 2016

uestion
Question 1
Chi-square is used to test differences between ____.
proportions
means
variances
modes

Question 2
For any given alpha level, c 2crit ____.
increases with increases in N
decreases with increases in N
increases with increases in degrees of freedom
decreases with increases in degrees of freedom

Question 3
To compute c 2, the entries in the contingency table should be ____.
frequencies
means
variances
degrees of freedom

Question 4
When evaluating c 2obt, the critical region for rejection of H0 ____.
lies under both tails of the distribution
lies under the right hand tail of the distribution
lies under the left hand tail of the distribution
lies in the middle of the distribution

Question 5
In a 2 ยด 2 contingency table, if we keep the marginals at their observed values, how many fo scores are free to vary?
3
0
1
2

Flag this Question Question 6
If a = 0.05, and df = 4, the value of c 2crit = ____.
9.488
0.711
7.815
11.070

Question 7
In the Mann-Whitney U test, the U value of 0 ____.
represents a low degree of separation between the two groups
implies that the two groups are identical
represents the greatest degree of separation between the two groups
indicates that the power of the experiment is very low.

Flag this Question Question 8
A Mann-Whitney U value of zero indicates ____.
you can reject the null hypothesis
low degree of separation between the scores of each group
zero difference between the two groups
high degree of separation between the scores of each group
Question 9
The Mann-Whitney U test uses ____.
only the direction of the scores
only the magnitude of the scores
both the magnitude and direction of the scores
only the mean of the scores

Flag this Question Question 10 Exhibit 17-4

A student at a Midwest college is interested in whether Psychology majors spend more or less time studying than English majors. She randomly selects 8 Psychology majors and 8 English majors and determines their weekly studying time. The following are the scores. Note one person dropped out of the study

Psychology Majors 16 12 13 10 9 10 8
English Majors 10 25 15 17 23 14 19 18

Refer to Exhibit 17-4. The value of Uobt is ____.

6

50

14

42

Question 11
Exhibit 17-4

A student at a Midwest college is interested in whether Psychology majors spend more or less time studying than English majors. She randomly selects 8 Psychology majors and 8 English majors and determines their weekly studying time. The following are the scores. Note one person dropped out of the study

Psychology Majors 16 12 13 10 9 10 8
English Majors 10 25 15 17 23 14 19 18

Refer to Exhibit 17-4. If a = 0.052 tail, Ucrit = ____.
7
10
46
49

Question 12
Exhibit 17-4

A student at a Midwest college is interested in whether Psychology majors spend more or less time studying than English majors. She randomly selects 8 Psychology majors and 8 English majors and determines their weekly studying time. The following are the scores. Note one person dropped out of the study

Psychology Majors 16 12 13 10 9 10 8
English Majors 10 25 15 17 23 14 19 18

Refer to Exhibit 17-4. Using a = 0.052 tail, what do you conclude?
reject H0; there is a significant difference in the amount of time Psychology and English majors study
reject H0; there is no difference in the amount of time Psychology and English majors study
accept H0; there is no difference in the amount of time Psychology and English majors study
retain H0; there is no difference in the amount of time Psychology and English majors study

Question 13
Exhibit 17-8
In Exhibit 17-8, there is (are) ____ degrees of freedom.
k – 1
1
2
4

Question 14
Exhibit 17-8

The value of c 2obt for the table in Exhibit 17-8 is ____.
47.43
17.96
4.07
9.71

Question 15
For a low value of df the c 2 distribution is ____.
normally distributed
positively skewed
negatively skewed
none of the above

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