Urgent!!! Help (Experimental Psych) im so confused with what should i use

Question

Identify what is the experimental design for each of the scenarios, and/or identify the appropriate statistical test to be used. Choose from the options.

Case 1: A team of psychologists is interested in the effects of sleep deprivation on new learning. College students (N=10) stay in a sleep lab for 2 days. Five participants are randomly assigned to an experimental condition in which they are not permitted to sleep during that period; the other five participants are allowed to sleep when they wish. At the end of two days, all participants attended a class that taught the principles of gene combination. They were given a test after the end of the class and counted the number of correct answers.

1.1. What is the study’s design?

A. Within-groups true experiment

B. Between-groups true experiment

C. Within-groups quasi-experiment

D. Between-groups quasi-experiment

1.2. What statistical test is appropriate for the given scenario?

A. One-way ANOVA

B. Two-way ANOVA

C. t-test for independence

D. t-test for dependence

E. Mann-Whitney U

Case 2: To evaluate a new physical therapy school, patients with lower back pain were randomly assigned to either the new school or to conventional occupational therapy. After 3 months the participants from each of the two groups were questioned about their back pain, and experimenters observed them lifting a weight by independent monitors. Their ability to lift the weights was then recorded and used as data.

2.1 What design is this?

A. True experiment

B. Quasi-experiment

C. Factorial Experiment

D. Naturalistic observation

2.2 What statistical test is appropriate for the given scenario? *

A. One-way ANOVA

B. Two-way ANOVA

C. t-test for independence

D. t-test for dependence

E. Mann-Whitney U

Case 3: Campus administrators want to evaluate the effectiveness of a new eating disorders prevention program. Students who attend a series of campus programs about eating disorders are given a survey that asks about their eating patterns. Approximately 6 months after the prevention program, the same participants are contacted and asked to complete the same survey. Administrators then tested whether students reported healthier eating patterns after participation in the program.

3.1. What is the design of the study?

A. Within-groups true experiment

B. Between-groups true experiment

C. Within-groups quasi-experiment

D. Between-groups quasi-experiment

E. Factorial Experiment

3.2 What statistical test is appropriate for the given scenario? *

A. One-way ANOVA

B. Two-way ANOVA

C. t-test for independence

D. t-test for dependence

E. Mann-Whitney U

Answer 1

1.1: B.

There was a randomized group of participants which leads me to believe it was it is a true experiment. The groups were also given alternate conditions and then tested to see the differences between the groups which is why I think it is Between.

1.2: C.

T- Test would help the researchers determine correlations or differences between two groups or variables.

2.1: C

Due to the numbers of variables in this experiment ( 2 groups sent to two different locations and receiving 2 different types of therapy I would think this is a Factorial Design.

2.2 B

I believe a 2 way anova would be the best bet in assessing the effect of the 2 variables (the groups and their therapy) You can isolate the effect of each group through this method.

3.1. C

Because there is no randomization, control group or replication of the experiment, I believe this would fall under within quasi because they are evaluating the same group, pre and post test.

3.2 D