Statistics MCQs
Statistics MCQs cover probability, sampling, hypothesis testing, correlation, regression, and data interpretation. Ideal for CSS, NTS, PMS, GAT, and university exams, they boost conceptual understanding, analytical skills, and real-world statistical application.
Q: The number of observations divided by the number of classes gives
A) Class boundary
B) Class width
C) Frequency
D) Midpoint
✅ Correct Answer: B
Explanation: Class width is calculated as total range divided by the number of classes.
Q: A scatter plot is best used to examine
A) Mean
B) Correlation
C) Frequency
D) Causation
✅ Correct Answer: B
Explanation: Scatter plots visually display relationships or correlations between two variables.
Q: Confidence level of 95% means
A) Result is always accurate
B) Interval includes the true parameter in 95% of cases
C) 95% data is correct
D) 5% chance of error
✅ Correct Answer: B
Explanation: A 95% confidence level means the interval will contain the population parameter in 95% of repeated samples.
Q: Coefficient of variation is calculated as
A) Standard deviation × Variance
B) Standard deviation/Mean
C) Mean/Standard deviation
D) Mean × Standard deviation
✅ Correct Answer: B
Explanation: Coefficient of variation is the ratio of standard deviation to mean, often expressed as a percentage.
Q: If events A and B are mutually exclusive, their joint probability is
A) 0.5
B) 1
C) 0
D) Undefined
✅ Correct Answer: C
Explanation: Mutually exclusive events cannot happen together, so their joint probability is zero.