Instructions: For each experimental design and results, answer the questions about main effects andinteractions as indicated.

1.Design 1Can rewarding people decrease how much you might be distracted?People were given a task to find differences. Some people were offered $5 for finding as many items as possible, others were not given a reward.People were distracted using a cell phone text buzzing. IVa was distraction or not and IVb was reward or not.There were a total of 15 differences

IVb

Rewardno reward

9

3

11

8

distraction

non distract

Note: Use the "eyeball method" to answer these questions.

Is there a main effect of IVA (distraction)? ________

Overall group means: ________ A1

________ A2

Describe main effect (or lack of) in words appropriately

Is there a main effect of IVB (reward)? ________

Overall group means: ________ B1

________ B2

Describe main effect (or lack of) in words appropriately

Is there an A x B interaction? ________

How do you know (describe interaction in words)?

1.Design 3

A researcher studied the influence of a woman's attractiveness and intelligence on her dating desirability. Male participants read a "dating profile" accompanied by a photo of an attractive or average-looking young woman; a no photo condition also was used. Intelligence was manipulated by reporting her college GPA as 3.8 or 2.5. Participants then rated the likelihood the woman would be asked out by most men on a 10-point scale.

This figure displays the results of the study.

No Photo (A1)Average (A2)Attractive (A3)

Note: Use the "eyeball method" to answer these questions:

Hint: The main effects may be easier to determine if you create own data matrix.

Is there a main effect of IVA? ________

Overall group means: ________ A1

________ A2

________ A3

Describe main effect (or lack of) in words appropriately

Is there a main effect of IVB? ________

Overall group means: ________ B1

________ B2

Describe main effect (or lack of) in words appropriately

Is there an A x B interaction? ________

Describe the interaction

Design 5

Cooper and Zubeck (1958) studied the influence of different environments on maze-running performance in rats bred to be genetically "maze bright" or "maze dull." Their results were:

Mean Errors in Maze-Running ^a

Environmental Conditions (IVB)

Genetic Line (IVA)

Restricted

Normal

Enriched

Dull

169.5

164.0

119.7

Bright

169.7

117.0

111.2

^a The higher the score, the poorer the performance.

Note: Use the "eyeball method" to answer these questions.

Is there a main effect of genetic line (IVA)?________

Overall group means:________ dull (A1)

________ bright (A2)

Describe the group differences in words using the appropriate labels and terminology:

Is there a main effect of Environment? (IV B)

Overall means for each condition

RestrictedNormalEnriched

Describe main effect (or lack of) in words appropriately

Is there a Genetic Line x Environment (A x B) interaction? ________ Graph the interaction:

RestrictedNormalEnriched

Describe the interaction in words, that is, the way you would write up a results section.