AP PSYCHOLOGY

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RESEARCH METHODS THINKING CRITICALLY WITH PSYCHOLOGICAL SCIENCE

THE SCIENTIFIC METHOD AND DESCRIPTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Suppose a researcher wants to study the effect of drug A on subjects’ alertness. He divides 100 subjects into two groups of 50, an experimental group and a control group. He dissolves drug A in saline solution and injects it into all the subjects in the experimental group. He then gives all the control group subjects an injection of only saline solution.What is the independent variable?
A
drug A
B
saline solution
C
the subjects
D
the needles
Explanation: 

Detailed explanation-1: -Extraneous Variables: Conditions that a researcher wants to prevent from affecting the outcomes of the experiment (e.g., number of hours slept before the experiment). To identify cause-and-effect relationships, we conduct experiments.

Detailed explanation-2: -Survey research a research method involving the use of standardized questionnaires or interviews to collect data about people and their preferences, thoughts, and behaviors in a systematic manner.

Detailed explanation-3: -In most cases, participants are randomly assigned to either a control group or an experimental group. Because participants are randomly assigned to either group, we can assume that the groups are essentially identical with the exception of the manipulation of the independent variable in the experimental group.

Detailed explanation-4: -A two-group design is when a researcher divides his or her subjects into two groups and then compares the results. The two groups usually consist of a control group, who does not get the treatment, and a treatment or experimental group, who does get the treatment.

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