Why should you use an ANOVA rather than a lot of T-tests?
Performing lots of t-tests increases the probability of making a Type 1 error
Performing lots of t-tests increases the probability of making a Type 2 error
Performing lots of t-tests increases the chance of failing to reject a false null hypothesis
All of the above
The ANOVA statistic is calculated by ____________
Subtracting the between groups variance from the within groups variance
Adding the between groups variance to the within groups variance
Dividing the between groups variance by the within groups variance
Multiplying the between groups variance by the within groups variance
You calculate an F ratio and get a value more than 1. How would you interpret this?
There is more between groups variance than within groups variance
There is the same amount of between groups variance as within groups variance
There is less between groups variance than within groups variance
There is no within groups variance
You have calculated the SSbetween as 10 and the SStotal as 15, what would the SSwithin be?
5
0.67
-5
25
Your study has four conditions with 20 participants in each condition. What would the df-within be?
79
76
77
80
Which of the following is the correct way to calculate the MSbetween
SSbetween / df-between
SSbetween / SStotal
SSbetween * df-between
SSbetween * df-total
A researcher wants to see if caffeine improves mathematics ability. She randomly assigned participants to three treatment groups: no caffeine (control), 40mg of coffee, and 80mg of coffee. After the treatment, all participants took a maths test. A one-way ANOVA was performed on the data.
The output is shown below, but the F-value is missing. Using the other information in the table what should the F-value be?
1.65
22.32
13.47
11.00
What should the researcher conclude from the ANOVA results shown in question 7?
There was a significant effect of treatment type on maths ability
There was no significant effect of treatment type on maths ability
Maths ability was significantly worse with no caffeine
Caffeine significantly improves maths ability
What does the eta squared tell us?
If there is a significant difference between groups
How much variance in the dependent variable can be accounted for by the independent variable
How much variance in the independent variable can be accounted for by the dependent variable
If homogeneity has been established
If an author reports the results of an ANOVA as F (4, 65) = 9.56, p = 0.1, what is the between-groups degrees of freedom
65
9.56
4
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