Deck 8: One-Way Repeated Measures Anova

Question 1

What is the assumption of sphericity?

A) The assumption that the variance in each condition is similar.
B) The assumption that the variance in each condition is not similar.
C) The assumption that the variance in the difference scores is similar.
D) The assumption that the variance in the difference scores is not similar.

Answer 1

C

Question 2

Why do we name one-way repeated measures ANOVA as one way and repeated?

A) It is one way because we are only manipulating one dependent variable and it is repeated because we have just one group of participants who do experimental conditions.
B) It is one way because we have just one group of participants who do experimental conditions and it is repeated because we are only manipulating one independent variable which repeats itself.
C) It is one way because we are only manipulating one independent variable and it is repeated because we have just one group of participants who are tested more than once on different conditions of the independent variable.
D) It is one way because we are only manipulating one dependent variable and it is repeated because we repeat the same task with one group of participants.

Answer 2

C

Question 3

Which of the following options is correct about planned and post hoc contrasts?

A) You can use both planned and post hoc contrasts together for further analysis.
B) You cannot use planned and post hoc contrasts for further analysis.
C) You can use post hoc contrast with one-tailed hypotheses, and planned contrasts with two-tailed hypotheses.
D) You can use planned contrast with one-tailed hypotheses, and post hoc contrasts with two-tailed hypotheses.

Answer 3

D

Question 4

If you establish that Mauchly's Test of Sphericity is significant it suggests

A) that the data you have collected have not violated the assumption that there is sphericity in the data - different variance in the difference scores across conditions.
B) that the data you have collected have not violated the assumption that there is sphericity in the data - similar variance in the difference scores across conditions.
C) that the data you have collected have violated the assumption that there is sphericity in the data - similar variance in the difference scores across conditions.
D) that the data you have collected have violated the assumption that there is a lack of sphericity in the data - similar variance in the difference scores across conditions.

Question 5

When you establish that assumption of sphericity has been violated, what should you do next?

A) Use one of the non-parametric tests to apply the appropriate correction.
B) Collect more data to reduce the random variance in the dataset.
C) You can continue your analysis. SPSS offers you a correction that you can use in this situation. You can use several t tests comparing individual means.
D) You can continue your analysis. SPSS offers you a correction that you can use in this situation. Greenhouse-Geisser correction is the one that is most frequently used.

Question 6

How does the Greenhouse-Geisser correction work?

A) It works by adjusting the degrees of freedom (df) and making them smaller, which has the effect of making your analysis more significant.
B) It works by adjusting the degrees of freedom (df) and making them larger, which has the effect of making your analysis more significant.
C) It works by adjusting the degrees of freedom (df) and making them larger, which has the effect of making your analysis less significant.
D) It works by adjusting the degrees of freedom (df) and making them smaller, which has the effect of making your analysis less significant.

Question 7

There are lots of tables under the main ANOVA output from SPSS. Which output do you have to look at if you want to interpret post hoc contrasts?

A) Pairwise comparisons table
B) Within-subjects effects table
C) Within-subjects factors table
D) Within-subjects contrasts table

Question 8

There are lots of tables under the main ANOVA output from SPSS. Which output do you have to look at if you want to interpret planned contrasts?

A) Within-subjects factors table
B) Within-subjects contrasts table
C) Pairwise comparisons table
D) Within-subjects effects table

Question 9

When do you need to use the non-parametric equivalent of ANOVA?

A) When the assumption of normality was violated
B) When the assumption of sphericity was violated
C) When the assumption of independence was violated
D) When the assumption of homogeneity was violated

Question 10

When you interpret the pairwise comparisons table you have to report

A) all the rows presented.
B) only the first three rows.
C) The rows representing all of the combinations of the condition pairs. If the pair A-B was reported you also have to report pair B-A.
D) The rows representing all of the unique combinations of the condition pairs. If the pair A-B was reported you don't have to report pair B-A.

Question 11

In the worksheet exercise, in which condition was the least variability?

A) Nine months later
B) Six months later
C) Three months later
D) After discharge

Question 12

In the worksheet exercise, what is the correct interpretation of the sphericity analysis?

A) It is significant, so the assumption has been met.
B) It is significant, so the assumption has not been met.
C) It is not significant, so the assumption has been met.
D) It is not significant, so the assumption has not been met.

Question 13

In the worksheet exercise, which rows from the "Test of Within Subjects Effects" table should you read the ANOVA statistics?

A) Sphericity assumed
B) Greenhouse-Geisser
C) Huynh-Feldt
D) Lower-bound

Question 14

In the worksheet exercise, if you were to run post hoc comparisons, how many pairwise comparisons should you report?

A) Twelve
B) Six
C) Nine
D) Three

Question 15

In the worksheet exercise, which of the following would not be an appropriate way to present the descriptive statistics?

A) Line graph with error bars
B) Pie chart
C) Bar graph with error bars
D) Table of descriptive statistics