#1
Which of the following is an example of a confounding variable?
The temperature of the room where the study is conducted
ExplanationA factor other than the independent variable that may affect the outcome.
#2
What is the purpose of a control group in an experiment?
To provide a comparison for the experimental group
ExplanationTo isolate the effect of the independent variable by comparing it to a group that does not receive the treatment.
#3
Which of the following is an example of a control variable?
The temperature of the room in which the study is conducted
ExplanationA variable held constant to prevent it from influencing the outcome of the study.
#4
What is the purpose of random assignment in experimental design?
To ensure that the experimental and control groups have equal characteristics
ExplanationTo minimize pre-existing differences between groups, ensuring that any differences observed are due to the treatment.
#5
Which of the following is a characteristic of a true experimental design?
Random assignment of participants to groups
ExplanationIt includes random assignment to ensure unbiased group selection.
#6
What is the purpose of blinding in a study?
To minimize bias in the collection and interpretation of data
ExplanationTo prevent conscious or unconscious biases from influencing study outcomes.
#7
What is the purpose of a pilot study?
To test the feasibility of conducting the main study
ExplanationTo identify and address potential issues before conducting the full-scale study.
#8
What is the purpose of counterbalancing in experimental design?
To balance the order of treatments across participants
ExplanationTo control for order effects by ensuring each treatment is experienced in every possible sequence.
#9
Which of the following is an example of a quasi-experimental design?
Pre-test post-test design
ExplanationIt lacks random assignment and control group, often due to practical or ethical constraints.
#10
What is the purpose of a placebo in a double-blind study?
To serve as a comparison for the experimental treatment
ExplanationTo distinguish between the effects of the treatment and psychological factors like expectation.
#11
In an experimental study, what does it mean if the results are statistically significant?
The results are unlikely to have occurred by random variation alone
ExplanationThe observed effect is probably not due to chance.
#12
Which of the following is a characteristic of a crossover design?
The same participants receive multiple treatments in a random order
ExplanationEach participant serves as their own control, receiving treatments in different orders.
#13
Which of the following is a disadvantage of a within-subjects design?
It is susceptible to order effects
ExplanationParticipants' responses may be influenced by the order in which they experience conditions.
#14
Which of the following is a disadvantage of a double-blind design?
It is difficult to implement in practice
ExplanationIt requires careful management to ensure neither participants nor researchers know which condition they are in.
#15
What does it mean if a study has low external validity?
The study findings cannot be generalized to other populations or settings
ExplanationThe extent to which study findings can be generalized to real-world settings or other populations.