Test Bank for Essentials of Statistics for the
Behavioral Sciences – 9th Edition (Gravetter,
Wallnau & Forzano) | Complete All Chapters
with Verified Answers
Full Exam Coverage: Essentials of Statistics for the
Behavioral Sciences (9th Edition)
(Gravetter, Wallnau & Forzano)
1.
A psychologist collects anxiety scores from 25 participants
and summarizes them using averages and graphs without
making generalizations. Which statistical approach is
being used?
A. Inferential statistics
B. Descriptive statistics
C. Parametric testing
D. Hypothesis testing
Answer: B
Rationale: Descriptive statistics summarize and organize
data without making conclusions beyond the sample.
,2.
A researcher labels participants as “depressed,” “non-
depressed,” and “mildly depressed” without numerical
meaning. Which measurement scale is represented?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer: B
Rationale: Ordinal scales indicate order but lack equal
intervals between categories.
3.
A dataset has extreme high scores that pull the average
upward significantly. Which measure of central tendency
is most affected?
A. Median
B. Mode
C. Mean
D. Range
Answer: C
Rationale: The mean is sensitive to outliers and shifts
toward extreme values.
,4.
A researcher calculates the spread of scores around the
mean using squared deviations. Which measure is being
computed?
A. Range
B. Variance
C. Standard deviation
D. Median
Answer: B
Rationale: Variance uses squared deviations from the
mean to measure variability.
5.
A student scores 85 on a test with mean 75 and standard
deviation 5. What does a positive z-score indicate in this
context?
A. Score is below average
B. Score equals average
C. Score is above average
D. Score is unrelated
Answer: C
Rationale: Positive z-scores indicate values above the
mean.
, 6.
A coin is flipped twice, and the researcher calculates the
probability of getting two heads. Which concept applies?
A. Conditional probability
B. Independent events
C. Sampling error
D. Regression
Answer: B
Rationale: Each coin flip is independent; outcome of one
does not affect the other.
7.
A researcher repeatedly samples from a population and
computes means to form a distribution of sample means.
What is this called?
A. Raw distribution
B. Frequency distribution
C. Sampling distribution
D. Population distribution
Answer: C
Rationale: A sampling distribution consists of sample
statistics like means.
Behavioral Sciences – 9th Edition (Gravetter,
Wallnau & Forzano) | Complete All Chapters
with Verified Answers
Full Exam Coverage: Essentials of Statistics for the
Behavioral Sciences (9th Edition)
(Gravetter, Wallnau & Forzano)
1.
A psychologist collects anxiety scores from 25 participants
and summarizes them using averages and graphs without
making generalizations. Which statistical approach is
being used?
A. Inferential statistics
B. Descriptive statistics
C. Parametric testing
D. Hypothesis testing
Answer: B
Rationale: Descriptive statistics summarize and organize
data without making conclusions beyond the sample.
,2.
A researcher labels participants as “depressed,” “non-
depressed,” and “mildly depressed” without numerical
meaning. Which measurement scale is represented?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer: B
Rationale: Ordinal scales indicate order but lack equal
intervals between categories.
3.
A dataset has extreme high scores that pull the average
upward significantly. Which measure of central tendency
is most affected?
A. Median
B. Mode
C. Mean
D. Range
Answer: C
Rationale: The mean is sensitive to outliers and shifts
toward extreme values.
,4.
A researcher calculates the spread of scores around the
mean using squared deviations. Which measure is being
computed?
A. Range
B. Variance
C. Standard deviation
D. Median
Answer: B
Rationale: Variance uses squared deviations from the
mean to measure variability.
5.
A student scores 85 on a test with mean 75 and standard
deviation 5. What does a positive z-score indicate in this
context?
A. Score is below average
B. Score equals average
C. Score is above average
D. Score is unrelated
Answer: C
Rationale: Positive z-scores indicate values above the
mean.
, 6.
A coin is flipped twice, and the researcher calculates the
probability of getting two heads. Which concept applies?
A. Conditional probability
B. Independent events
C. Sampling error
D. Regression
Answer: B
Rationale: Each coin flip is independent; outcome of one
does not affect the other.
7.
A researcher repeatedly samples from a population and
computes means to form a distribution of sample means.
What is this called?
A. Raw distribution
B. Frequency distribution
C. Sampling distribution
D. Population distribution
Answer: C
Rationale: A sampling distribution consists of sample
statistics like means.
