Understanding Experiments with Two Groups - Answer Key
Twenty Sets $1 =$

question 63

Short Answer

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
GROUP $1 =$ Received drug
GROUP $2 =$ Received placebo
Variable $=$ Depression level
$\begin{array} { l l l l } \text { GROUP } & N & \text { Mean } & S D \\ \text { GROUP 1 } & 10 & 3.21 & 1.035 \\ \text { GROUP 2 } & 10 & 5.77 & 1.772 \\ t = 5.785 & d f = 9 & p = 0.017 & \text { Cohen's } d = .88 \end{array}$
-What kind of research design was used?

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Definitions:

Mature Ethnic Identity

The stage at which an individual has explored and fully understands their ethnic background, leading to a strong sense of belonging and acceptance of their cultural heritage.

Antidrug Norms

Societal standards and beliefs that oppose the use of illegal drugs and support behaviors that resist drug use.

Drug Problems

Issues arising from the abuse or dependency on illegal drugs or the misuse of prescription medications, leading to personal, social, or health consequences.

Internalizing Problems

Refers to psychological struggles that manifest internally, such as anxiety, depression, and excessive worry, often leading to withdrawn or inhibited behavior.