PSY 2010 EXAM 2026 SCRIPT
COMPREHENSIVE ANSWERS VERIFIED
EXCELLENCE
◉ Which of the following best explains the meaning of a t-value?
The exact probability of the result
The size of the population
How large the observed difference is relative to variability
The number of participants
Answer: How large the observed difference is relative to variability
◉ A researcher randomly assigns participants to either a caffeine
group or a no-caffeine group and measures reaction time. Each
participant is only in one condition. Which test should be used?
One-sample t-test
,Independent samples t-test
Dependent samples t-test
Mixed Design
Answer: Independent samples t-test
◉ A study compares a sample's average test score to a national
average score, but the population standard deviation is unknown.
Which test should be used?
z-test
Independent samples t-test
One-sample t-test
Dependent samples t-test
Answer: One-sample t-test
◉ Why might the effect size (Cohen's d) be inflated in a dependent
samples design?
, Sample size is too small
Population mean is unknown
Individual differences are included in the effect
df is too large
Answer: Individual differences are included in the effect
◉ Which assumption is UNIQUE to the dependent samples t-test
(compared to independent t-tests)?
Independence between participants
Normal distribution of difference scores
Normal distribution of raw scores
Equal sample sizes
Answer: Normal distribution of difference scores
COMPREHENSIVE ANSWERS VERIFIED
EXCELLENCE
◉ Which of the following best explains the meaning of a t-value?
The exact probability of the result
The size of the population
How large the observed difference is relative to variability
The number of participants
Answer: How large the observed difference is relative to variability
◉ A researcher randomly assigns participants to either a caffeine
group or a no-caffeine group and measures reaction time. Each
participant is only in one condition. Which test should be used?
One-sample t-test
,Independent samples t-test
Dependent samples t-test
Mixed Design
Answer: Independent samples t-test
◉ A study compares a sample's average test score to a national
average score, but the population standard deviation is unknown.
Which test should be used?
z-test
Independent samples t-test
One-sample t-test
Dependent samples t-test
Answer: One-sample t-test
◉ Why might the effect size (Cohen's d) be inflated in a dependent
samples design?
, Sample size is too small
Population mean is unknown
Individual differences are included in the effect
df is too large
Answer: Individual differences are included in the effect
◉ Which assumption is UNIQUE to the dependent samples t-test
(compared to independent t-tests)?
Independence between participants
Normal distribution of difference scores
Normal distribution of raw scores
Equal sample sizes
Answer: Normal distribution of difference scores
