CALIFORNIA COMMUNITY COLLEGE PSYC
100 EXAM 2026 PRACTICE QUESTIONS
WITH ANSWERS ORIGINAL QUESTIONS,
DETAILED RATIONALES & STUDY GUIDE
1. A student observes that people who sleep fewer than five hours
per night tend to report higher levels of stress. The student
concludes that insufficient sleep causes stress. Which methodological
problem is most important in this conclusion?
A. The observation is necessarily unethical.
B. Correlation does not establish causation.
C. Stress cannot be measured scientifically.
D. Sleep is always an independent variable.
Answer: B. Correlation does not establish causation.
Rationale: A correlation indicates that two variables are related, but it
does not establish that one variable causes the other. A third variable,
such as workload, illness, or financial difficulty, could influence both
sleep and stress. To establish causation, researchers generally need an
appropriate experimental design with control over variables and
random assignment.
2. Which research method would be most appropriate for
determining whether a newly developed study technique actually
causes students to perform better on an examination?
A. Naturalistic observation
B. Correlational research
C. Controlled experiment
D. Case study
Answer: C. Controlled experiment
1
,Rationale: An experiment is the strongest method for testing a cause-
and-effect relationship. Researchers could randomly assign students to
use either the new study technique or a comparison technique and
then measure examination performance. Random assignment helps
distribute preexisting differences between groups.
3. A researcher randomly selects 500 students from a college and
asks them about their attitudes toward online learning. The 500
students represent the:
A. Population
B. Sample
C. Independent variable
D. Experimental group
Answer: B. Sample
Rationale: The sample is the subset of individuals actually selected to
participate in a study. The population is the larger group the
researcher wants to understand. Random sampling increases the
likelihood that the sample will adequately represent the population.
4. In an experiment examining whether caffeine affects reaction
time, participants receive either caffeine or a placebo. Reaction time
is measured afterward. What is the dependent variable?
A. Caffeine
B. Placebo
C. Reaction time
D. Participant age
Answer: C. Reaction time
2
,Rationale: The independent variable is what the researcher
manipulates—in this case, caffeine exposure. The dependent variable
is the outcome being measured. Therefore, reaction time is the
dependent variable because researchers are examining whether it
changes as a result of caffeine exposure.
5. Why is random assignment particularly important in an
experiment?
A. It guarantees that the hypothesis will be correct.
B. It eliminates the need for a control group.
C. It helps distribute participant characteristics across experimental
groups.
D. It guarantees that participants will answer honestly.
Answer: C. It helps distribute participant characteristics across
experimental groups.
Rationale: Random assignment reduces systematic differences
between groups before the experimental manipulation occurs.
Characteristics such as motivation, intelligence, prior knowledge, and
personality are more likely to be distributed approximately evenly. This
strengthens the researcher's ability to attribute differences in outcomes
to the independent variable.
6. A psychologist measures depression using a questionnaire and
obtains nearly identical scores when the same participants complete
the questionnaire twice under similar conditions. This primarily
demonstrates:
A. Validity
B. Reliability
3
, C. Random assignment
D. Experimental control
Answer: B. Reliability
Rationale: Reliability refers to the consistency or stability of a
measurement. If a measure produces similar results under consistent
conditions, it demonstrates reliability. Validity concerns whether the
instrument actually measures what it claims to measure.
7. A psychologist wants to study how children naturally interact
during recess without interfering with their behavior. Which
method would be most appropriate?
A. Naturalistic observation
B. Laboratory experiment
C. Double-blind experiment
D. Survey using leading questions
Answer: A. Naturalistic observation
Rationale: Naturalistic observation involves observing behavior in a
natural environment without manipulating the situation. It allows
researchers to study behavior as it normally occurs, although it
provides less control over variables than an experiment.
8. Which statement best describes informed consent in psychological
research?
A. Participants must be guaranteed a particular outcome.
B. Participants should receive sufficient information to make a voluntary
decision about participation.
C. Participants must know the researcher's hypothesis.
D. Participants may never withdraw once the study begins.
4
100 EXAM 2026 PRACTICE QUESTIONS
WITH ANSWERS ORIGINAL QUESTIONS,
DETAILED RATIONALES & STUDY GUIDE
1. A student observes that people who sleep fewer than five hours
per night tend to report higher levels of stress. The student
concludes that insufficient sleep causes stress. Which methodological
problem is most important in this conclusion?
A. The observation is necessarily unethical.
B. Correlation does not establish causation.
C. Stress cannot be measured scientifically.
D. Sleep is always an independent variable.
Answer: B. Correlation does not establish causation.
Rationale: A correlation indicates that two variables are related, but it
does not establish that one variable causes the other. A third variable,
such as workload, illness, or financial difficulty, could influence both
sleep and stress. To establish causation, researchers generally need an
appropriate experimental design with control over variables and
random assignment.
2. Which research method would be most appropriate for
determining whether a newly developed study technique actually
causes students to perform better on an examination?
A. Naturalistic observation
B. Correlational research
C. Controlled experiment
D. Case study
Answer: C. Controlled experiment
1
,Rationale: An experiment is the strongest method for testing a cause-
and-effect relationship. Researchers could randomly assign students to
use either the new study technique or a comparison technique and
then measure examination performance. Random assignment helps
distribute preexisting differences between groups.
3. A researcher randomly selects 500 students from a college and
asks them about their attitudes toward online learning. The 500
students represent the:
A. Population
B. Sample
C. Independent variable
D. Experimental group
Answer: B. Sample
Rationale: The sample is the subset of individuals actually selected to
participate in a study. The population is the larger group the
researcher wants to understand. Random sampling increases the
likelihood that the sample will adequately represent the population.
4. In an experiment examining whether caffeine affects reaction
time, participants receive either caffeine or a placebo. Reaction time
is measured afterward. What is the dependent variable?
A. Caffeine
B. Placebo
C. Reaction time
D. Participant age
Answer: C. Reaction time
2
,Rationale: The independent variable is what the researcher
manipulates—in this case, caffeine exposure. The dependent variable
is the outcome being measured. Therefore, reaction time is the
dependent variable because researchers are examining whether it
changes as a result of caffeine exposure.
5. Why is random assignment particularly important in an
experiment?
A. It guarantees that the hypothesis will be correct.
B. It eliminates the need for a control group.
C. It helps distribute participant characteristics across experimental
groups.
D. It guarantees that participants will answer honestly.
Answer: C. It helps distribute participant characteristics across
experimental groups.
Rationale: Random assignment reduces systematic differences
between groups before the experimental manipulation occurs.
Characteristics such as motivation, intelligence, prior knowledge, and
personality are more likely to be distributed approximately evenly. This
strengthens the researcher's ability to attribute differences in outcomes
to the independent variable.
6. A psychologist measures depression using a questionnaire and
obtains nearly identical scores when the same participants complete
the questionnaire twice under similar conditions. This primarily
demonstrates:
A. Validity
B. Reliability
3
, C. Random assignment
D. Experimental control
Answer: B. Reliability
Rationale: Reliability refers to the consistency or stability of a
measurement. If a measure produces similar results under consistent
conditions, it demonstrates reliability. Validity concerns whether the
instrument actually measures what it claims to measure.
7. A psychologist wants to study how children naturally interact
during recess without interfering with their behavior. Which
method would be most appropriate?
A. Naturalistic observation
B. Laboratory experiment
C. Double-blind experiment
D. Survey using leading questions
Answer: A. Naturalistic observation
Rationale: Naturalistic observation involves observing behavior in a
natural environment without manipulating the situation. It allows
researchers to study behavior as it normally occurs, although it
provides less control over variables than an experiment.
8. Which statement best describes informed consent in psychological
research?
A. Participants must be guaranteed a particular outcome.
B. Participants should receive sufficient information to make a voluntary
decision about participation.
C. Participants must know the researcher's hypothesis.
D. Participants may never withdraw once the study begins.
4
