Question

1.Given an interval or ratio scale dependent variable and a nominal independent variable with three or more levels, we could use a(n) ________ to analyze the data.

Select one:

A. t test

B. ANOVA

C. z test

D. PRE test

2.

Interested in the effects of different kinds of instruction on videogame performance, Martin asks 30 college freshmen to each play an hour of Ratchet and Klank. Participants are randomly assigned to one of three instruction groups: (1) complete the tasks as quickly as possible, (2) conserve as much health as possible (i.e., play more carefully), or (3) find gold bolts (worth lots of money in equipment and ammunition). If Martin averages the scores for each instruction group and then compares them, any differences in the means of the instruction groups reflect:

Select one:

A. within-groups variance.

B. between-groups variance.

C. individual differences in hand-eye coordination.

D. inherent differences in the ability of the college freshmen to play video games.

3.

Dr. Sanders was interested in investigating the effects of stress on memory. She exposed participants to public speaking stress and room temperature stress and gave them a memory measure immediately after exposure to the two stressors. Dr. Sanders also gave participants the memory measure at baseline, when they first entered the research laboratory. Dr. Sanders hypothesized that participants' memories would be most affected by the two stressors compared to the baseline condition. What statistical test should Dr. Sanders use to test her hypothesis?

Select one:

A. within-groups ANOVA

B. independent samples t test

C. between-groups ANOVA

D. single-sample t test

Answer 1

1)B. ANOVA

2) B. between-groups variance.

3)as same participants are used for each group ; therefore A. within-groups ANOVA