WGU C784 Objective Assessment Test
Bank (2025-2026 Edition) - The
Humanities: Culture, Continuity and
Change by Henry M. Sayre - 150 Verified
Exam Questions and Answers
Q1
A researcher measures the blood pressure of 50 patients. What
type of data is this?
A) Categorical nominal
B) Categorical ordinal
C) Quantitative discrete
D) Quantitative continuous
Answer: D
Rationale: Blood pressure is measured on a scale and can take
any value within a range (e.g., 118.2 mmHg). It is not countable in
whole numbers, so it is quantitative continuous.
Q2
In a normal distribution, approximately what percentage of data
falls within ±1 standard deviation of the mean?
A) 50%
B) 68%
C) 95%
D) 99.7%
,Answer: B
Rationale: The empirical rule states: 68% within 1 SD, 95% within
2 SDs, 99.7% within 3 SDs.
Q3
A study finds a correlation coefficient of r = –0.85 between hours
of screen time and sleep quality. Which interpretation is correct?
A) More screen time causes worse sleep quality.
B) As screen time increases, sleep quality tends to increase.
C) As screen time increases, sleep quality tends to decrease.
D) There is no relationship.
Answer: C
Rationale: A negative r value indicates an inverse relationship. –
0.85 is strong, but correlation does not imply causation, so we
avoid “causes.”
Q4
What is the median of the dataset: 4, 8, 6, 5, 3?
A) 4
B) 5
C) 5.2
D) 6
Answer: B
Rationale: Sort: 3, 4, 5, 6, 8. Middle value = 5.
Q5
A p-value of 0.03 is obtained from a hypothesis test with α = 0.05.
What is the correct conclusion?
A) Fail to reject the null hypothesis.
B) Reject the null hypothesis.
,C) Accept the alternative hypothesis with 97% confidence.
D) The result is not statistically significant.
Answer: B
Rationale: If p < α, reject the null. 0.03 < 0.05 → reject null.
Q6
Which measure of central tendency is most affected by outliers?
A) Mean
B) Median
C) Mode
D) Range
Answer: A
Rationale: The mean uses all values, so extreme outliers pull it
significantly. The median is resistant to outliers.
Q7
A dataset has a variance of 16. What is the standard deviation?
A) 2
B) 4
C) 8
D) 256
Answer: B
Rationale: Standard deviation = √variance = √16 = 4.
, Q8
In a left-skewed distribution, the relationship between mean,
median, and mode is:
A) Mean < Median < Mode
B) Mean > Median > Mode
C) Mean = Median = Mode
D) Mode < Mean < Median
Answer: A
Rationale: In left-skewed (negative skew), the tail pulls the mean
left, so mean < median < mode.
Q9
If events A and B are independent, P(A) = 0.4, P(B) = 0.5, what is
P(A and B)?
A) 0.2
B) 0.9
C) 0
D) 0.45
Answer: A
Rationale: For independent events, P(A and B) = P(A) × P(B) = 0.4
× 0.5 = 0.2.
Q10
A 95% confidence interval for a mean is (12.5, 18.5). What is the
Bank (2025-2026 Edition) - The
Humanities: Culture, Continuity and
Change by Henry M. Sayre - 150 Verified
Exam Questions and Answers
Q1
A researcher measures the blood pressure of 50 patients. What
type of data is this?
A) Categorical nominal
B) Categorical ordinal
C) Quantitative discrete
D) Quantitative continuous
Answer: D
Rationale: Blood pressure is measured on a scale and can take
any value within a range (e.g., 118.2 mmHg). It is not countable in
whole numbers, so it is quantitative continuous.
Q2
In a normal distribution, approximately what percentage of data
falls within ±1 standard deviation of the mean?
A) 50%
B) 68%
C) 95%
D) 99.7%
,Answer: B
Rationale: The empirical rule states: 68% within 1 SD, 95% within
2 SDs, 99.7% within 3 SDs.
Q3
A study finds a correlation coefficient of r = –0.85 between hours
of screen time and sleep quality. Which interpretation is correct?
A) More screen time causes worse sleep quality.
B) As screen time increases, sleep quality tends to increase.
C) As screen time increases, sleep quality tends to decrease.
D) There is no relationship.
Answer: C
Rationale: A negative r value indicates an inverse relationship. –
0.85 is strong, but correlation does not imply causation, so we
avoid “causes.”
Q4
What is the median of the dataset: 4, 8, 6, 5, 3?
A) 4
B) 5
C) 5.2
D) 6
Answer: B
Rationale: Sort: 3, 4, 5, 6, 8. Middle value = 5.
Q5
A p-value of 0.03 is obtained from a hypothesis test with α = 0.05.
What is the correct conclusion?
A) Fail to reject the null hypothesis.
B) Reject the null hypothesis.
,C) Accept the alternative hypothesis with 97% confidence.
D) The result is not statistically significant.
Answer: B
Rationale: If p < α, reject the null. 0.03 < 0.05 → reject null.
Q6
Which measure of central tendency is most affected by outliers?
A) Mean
B) Median
C) Mode
D) Range
Answer: A
Rationale: The mean uses all values, so extreme outliers pull it
significantly. The median is resistant to outliers.
Q7
A dataset has a variance of 16. What is the standard deviation?
A) 2
B) 4
C) 8
D) 256
Answer: B
Rationale: Standard deviation = √variance = √16 = 4.
, Q8
In a left-skewed distribution, the relationship between mean,
median, and mode is:
A) Mean < Median < Mode
B) Mean > Median > Mode
C) Mean = Median = Mode
D) Mode < Mean < Median
Answer: A
Rationale: In left-skewed (negative skew), the tail pulls the mean
left, so mean < median < mode.
Q9
If events A and B are independent, P(A) = 0.4, P(B) = 0.5, what is
P(A and B)?
A) 0.2
B) 0.9
C) 0
D) 0.45
Answer: A
Rationale: For independent events, P(A and B) = P(A) × P(B) = 0.4
× 0.5 = 0.2.
Q10
A 95% confidence interval for a mean is (12.5, 18.5). What is the
