FREE EPPP Test Research Methods & Statistics Questions and Answers

Question 1

A researcher is studying the effectiveness of a new psychotherapy intervention for generalized anxiety disorder.
Participants are randomly assigned to either the treatment group (receiving the new therapy) or a control group (receiving a placebo intervention).
The researchers want to minimize the likelihood that participants' or therapists' expectations influence the results.
Which research design feature would best address this concern?

Accepted Answer

Double-blind procedure

Answer

Random sampling

Answer

Stratified sampling

Answer

Between-subjects design

Question 2

Which of the following statistical tests is most appropriate for examining the relationship between two categorical variables, such as gender (male/female) and preference for a specific type of therapy (CBT/Psychodynamic/Humanistic)?

Accepted Answer

Chi-square test of independence

Answer

Independent samples t-test

Answer

ANOVA

Answer

Pearson correlation coefficient

Question 3

A clinical psychologist is conducting a study where participants are assessed on their anxiety levels before and after a 12-week mindfulness intervention. To determine if there's a significant change in anxiety scores within the same group of individuals, which statistical test would be most appropriate?

Accepted Answer

Paired-samples t-test

Answer

One-way ANOVA

Answer

Mann-Whitney U test

Answer

Pearson's r

Question 4

In a research study, a p-value of .01 is obtained. Assuming an alpha level of .05, what is the correct interpretation of this result?

Accepted Answer

The observed effect is statistically significant, and the null hypothesis should be rejected.

Answer

There is a 1% chance that the null hypothesis is true.

Answer

There is a 99% chance that the alternative hypothesis is true.

Answer

The probability of Type I error is .01.

Question 5

A researcher is developing a new measure of social anxiety. They administer the measure to a group of participants and then, two weeks later, administer it to the same group again. They then correlate the scores from the first administration with the scores from the second administration. This procedure is primarily designed to assess which psychometric property of the measure?

Accepted Answer

Test-retest reliability

Answer

Content validity

Answer

Internal consistency

Answer

Construct validity

Question 6

In a study investigating the impact of sleep deprivation on cognitive performance, participants are randomly assigned to either a 4-hour sleep group or an 8-hour sleep group. Cognitive performance is measured using a standardized test. In this experimental design, what is the independent variable?

Accepted Answer

Amount of sleep (4 hours vs. 8 hours)

Answer

Cognitive performance scores

Answer

The standardized cognitive test

Answer

The participants' baseline cognitive abilities