A Researcher Is Interested in Knowing If Different Types of Treatments

question 102

Not Answered

A researcher is interested in knowing if different types of treatments have an effect on the number of relapses for clients with the diagnosis of alcoholism. He randomly selects a group of 24 clients from a waiting list at a local mental health center who consent to the study. Then he randomly assigns 6 subjects to each treatment group. Group 1 is a waiting list control group. They are given no treatment. Group 2 receives a medication that causes illness when alcohol is consumed. Group 3 gets cognitive behavior therapy, and Group 4 gets cognitive behavior therapy plus the drug. The researcher then records the number of relapses in the next 12 months. The following data are obtained.
a. State the alternative hypothesis.
b. State the null hypothesis.
c. What is the value of SS within ?
d. What is the value of SS between ?
e. What is the value of SS total ?
f. What is the value of F obt ?
g. What do you conclude, using a = 0.05?
h. What is the size of the effect, using ?
i. What is the size of the effect, using ²?

---

Definitions:

Dissociative Reference Group

A group with which an individual does not want to be associated or identified.

Computer Geek

A term often used to describe someone with a deep interest and expertise in computers and technology.

Jocks

A colloquial term often used to describe athletes or individuals who are particularly enthusiastic about sports, typically in a school or college setting.

Diffusion Of Responsibility

A socio-psychological phenomenon where individuals in a group are less likely to take action or feel responsible when others are present.