Question 1 

Describe any 3 of the 5 threats to internal validity (alternative explanations) that result from using a one group pretest posttest design.

Question 2

Define each and give an example: Straightforward manipulation and Staged manipulation

Question 3

A researcher was interested in the effects of sexual arousal on the ability to concentrate, and also wondered whether gender and age are important factors. The researcher had participants read passages that were low, medium, or high in sexual arousal content. The participants were divided into three age categories (18-24, 25-35, and 36-50 years). After reading the passage, participants were asked to perform a proofreading task; the researcher measured the number of errors detected on the task.

Answer each of the following in the space below:

The design is (e.g., 2 X 2 factorial) =______________________________________

Identify the independent or manipulated variable(s) and levels:

Is this an IV X PV design? If so, identify the participant variable(s):

Is this a repeated measures (within subject) design? If so, identify the repeated variable(s).

Identify the dependent variable(s).

State number of main effects.

Question 4

Clearly define the difference between single blind and double blind studies.

Question 5

Why are quasi-experimental designs called quasi?

Question 6

Using the information in the source table calculate the missing F and eta squared and write it in the answer box.

Question 7

List and describe the three main types of dependent variables (not IV’s) that are used in psychological research. Be sure to give a short example of each too.

Question 8

When all the subjects score very low on your dependent measure regardless of group then you have a __________________ effect.

Question 9

What is a “confederate’ in research?