Psyc 210 E3 Review

When the independent variable has more than two levels, why can't a researcher just run multiple t tests?

• the probability of making a Type I error in one of the tests increases

• the probability of making a Type II error in one of the tests increases

• degrees of freedom are lost

• this statement is wrong, we can run multiple t tests

If the p level is 0.10 and the null hypothesis is true, what is the probability of NOT making a Type I error?

• 0.10

• .90

• .95

• 0.00

How is the F ratio calculated?

• dividing a measure of between-groups variability by a measure of within-groups variability

• dividing a measure of within-groups variability by a measure of between-groups variability

• averaging the results from the t test for all possible two-group comparisons

• squaring all the scores

Tags

CCSS.HSS.ID.A.4

If between-groups variance is larger than within-groups variance, we can infer the sample means are ________ one another, and we ________ the null hypothesis

• similar to; reject

• similar to; fail to reject

• different from; fail to reject

• different from; reject

Tags

CCSS.HSS.ID.B.6B

When do we use an ANOVA?

• the population mean and the standard deviation are known

• given a scale dependent variable and a nominal independent variable with three or more levels

• given just the population mean

• given one or two nominal variables

How do we calculate between-groups df?

• subtracting 1 from the total number of subjects in the study

• subtracting 1 from the total number of groups in the study

• subtracting 1 from the number of subjects within each group then adding those numbers together

• multiplying the number of subjects by the number of conditions in the study then subtracting 1

What does a significant F statistic tell us?

• we fail to reject the null hypothesis

• the values of the means that are furthest apart are the only ones that are significant

• we do not know which specific means differ significantly

• the values of the means that are closest apart are the only ones that are significant

What is the F value for this data set?

(a)  

Answer explanation

Divide the MS for between groups by the MS for within groups to get the F value. 225/11.1 = 20.27

Which of the following are examples of post hoc tests?

• Cohens d

• Bonferroni

• Tukey

• Scheffe

Another name for a repeated measures ANOVA is...

• one way within groups

• ANCOVA

• f-test

• factorial ANOVA