Multiple Choice
Which of the following is a reason why a researcher interested in making a causal claim might choose not to conduct an experiment in psychology?
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2. Psychology Research
The Scientifc Method in Psychology
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Which of the following experiments would most likely contain experimental bias?
A
A double-blind study is conducted where neither participants nor experimenters know group assignments.
B
A researcher randomly assigns participants to control and experimental groups.
C
A researcher tests a new therapy and only selects participants who are likely to benefit from it.
D
Participants are selected using a random sampling method from the general population.
Verified step by step guidance1
Step 1: Understand what experimental bias means. Experimental bias occurs when the design, conduct, or analysis of an experiment systematically favors certain outcomes, often due to non-random selection or expectations influencing results.
Step 2: Review each option to identify potential sources of bias. For example, a double-blind study minimizes bias by preventing both participants and experimenters from knowing group assignments.
Step 3: Recognize that random assignment to control and experimental groups helps reduce bias by ensuring groups are comparable at the start of the experiment.
Step 4: Notice that selecting participants who are likely to benefit from the therapy introduces bias because the sample is not representative and may inflate the perceived effectiveness of the therapy.
Step 5: Understand that random sampling from the general population helps ensure the sample represents the population, reducing selection bias.
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