Deck 9: How Can I Tell If Scores Differ Between Three or More Groups One-Way Independent Measures Anova

Question 1

Why should you use an ANOVA, rather than lots of t tests?

A) Lots of t tests risks increasing familywise error
B) Lots of t tests risks reducing familywise error
C) Lots of ANOVAs risks increasing familywise error
D) Lots of ANOVAs risks reducing familywise error

Answer 1

A
Explanation: Lots of t tests risks increasing familywise error

Question 2

An ANOVA statistic is an…

A) A value
B) F ratio
C) A ratio
D) p value

Answer 2

B
Explanation: The F ratio is the statistic that you calculate when you conduct an ANOVA

Question 3

The ANOVA statistic is calculated by…

A) Adding the between groups variance to the within groups variance
B) Subtracting the between groups variance from the within groups variance
C) Multiplying the between groups variance by the within groups variance
D) Dividing the between groups variance by the within groups variance

Answer 3

D
Explanation: You can revise calculating the ANOVA statistic on pp156-161

Question 4

You calculate an F ratio and get a value less than 1. How would you interpret this?

A) There is more between groups variance than within groups variance
B) There the same amount of between groups variance and within groups variance
C) There is less between groups variance than within groups variance
D) There is no within groups variance

Question 5

What do the Sums of Squares (SS) tell you in the ANOVA calculation?

A) The SS are measures of only the between group variability in the dataset
B) The SS are measures of between group and within group variability in the dataset
C) The SS are measures of only the within group variability in the dataset
D) The SS are measures of only the total variability in the dataset

Question 6

You have calculated the SS_between as 8 and the SS_total as 10. What would the SS_within be?

A) 2
B) -2
C) 80
D) 18

Question 7

Your study has five conditions. What would the df_between be?

A) 5
B) 6
C) 4
D) 1

Question 8

Which of the following is the correct way to calculate the MS_within?

A) SS_within / df_within
B) SS_within * df_within
C) SS_within / SS_between
D) SS_within * SS_between

Question 9

You calculate an ANOVA with df_between of 3 and df_within of 13. If you use an alpha level of .050, what would the critical value be?

A) 3.81
B) 3.49
C) 3.41
D) 3.18

Question 10

Which is the correct way to report this ANOVA result?

A) F (13) = 3.62, p < .050
B) F (3, 13) = 3.62, p < .050
C) F = 3.62 (3, 13), p < .050
D) F (3, 13) < 3.62, p < .050

Question 11

What is the total of the raw scores for the Older age group?

A) 539
B) 61
C) 307
D) 45

Question 12

What is the sum of the totals squared (ΣT²)?

A) 460
B) 8882
C) 539
D) 26244

Question 13

How was the SS_error calculated?

A) 1306 + 1249.7143
B) 1306 - 1249.7143
C) 56.2857 + 19.1428
D) 56.2857 - 19.1428

Question 14

What is the MS_error?

A) 2.0635
B) 9.5714
C) 4.6384
D) 37.1429

Question 15

What is the calculated F ratio?

A) 9.5714
B) 2.0635
C) 56.2857
D) 4.6384