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

question 72

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 statistical analysis was used?

Identify various factors affecting embryonic development, including teratogens.

Understand cell differentiation and pattern formation mechanisms in embryonic development.

Recognize the importance of specific external signals in initiating key developmental processes.

Understand the concept and calculation of IQ.

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Definitions:

Hans Selye

A scientist known for his research on stress and its effects on the human body, introducing the concept of the General Adaptation Syndrome.

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Mathematical problems that involve calculating the rates at which workers complete certain tasks.

Unemployment

The situation of being without a job, despite being willing and able to work, typically measured as a percentage of the labor force.

Health Risk

The probability of experiencing harm or adverse effects on health as a result of exposure to a hazard.