Statistical Distributions MCQs (25)
1) A probability distribution describes?
A. How data is deleted
B. How probabilities are assigned to outcomes
C. How files are stored
D. How charts are designed
2) Distributions are mainly classified as?
A. Big and small
B. Discrete and Continuous
C. Fast and slow
D. Local and cloud
3) Example of a discrete distribution?
A. Normal
B. Binomial
C. Exponential
D. Uniform (continuous)
4) Example of a continuous distribution?
A. Poisson
B. Binomial
C. Normal
D. Geometric
5) Normal distribution is also called?
A. Square distribution
B. Bell curve
C. Zig-zag curve
D. Random curve
6) A normal distribution is symmetric about?
A. Mode
B. Mean
C. Variance
D. Standard deviation
7) In a normal distribution, mean = median = ?
A. Variance
B. Mode
C. Range
D. Skewness
8) Standard normal distribution has mean and SD as?
A. Mean=0, SD=1
B. Mean=1, SD=0
C. Mean=0, SD=0
D. Mean=1, SD=1
9) Z-score represents?
A. Data count
B. How many SDs from mean
C. Sum of values
D. Median value
10) Uniform distribution means?
A. All outcomes are equally likely
B. Only one outcome is likely
C. Outcomes are always negative
D. Outcomes depend on time
11) Binomial distribution is used when?
A. Infinite outcomes
B. Fixed trials with success/failure
C. Only time data
D. Only continuous data
12) Poisson distribution models?
A. Continuous time decay
B. Count of events in a fixed interval
C. Percentages only
D. Correlation
13) Exponential distribution is commonly used for?
A. Waiting time between events
B. Counting heads in coin toss
C. Ranking categories
D. Measuring correlation
14) Geometric distribution finds?
A. Trials until first success
B. Mean of data
C. Variance of mean
D. Symmetry of curve
15) Which distribution is used for sample mean (when population SD is known)?
A. Z distribution
B. Chi-square
C. F distribution
D. Weibull
16) t-distribution is commonly used when?
A. Sample size is small and SD unknown
B. Only categorical data
C. Data is always uniform
D. No sample data
17) Chi-square distribution is used in?
A. Testing independence in categorical data
B. Time series forecasting
C. Regression only
D. Clustering
18) F-distribution is used in?
A. ANOVA (comparing variances/means)
B. Counting events
C. Waiting time
D. Finding median
19) PDF stands for (in statistics)?
A. Public Data File
B. Probability Density Function
C. Print Data Form
D. Partial Data Format
20) CDF gives?
A. Probability that X ≤ x
B. Only mean value
C. Only variance
D. Only outliers
21) In a continuous distribution, probability at a single point is?
A. 1
B. 0
C. 0.5
D. Depends on mean
22) Skewness describes?
A. Direction of asymmetry
B. Total data size
C. Number of categories
D. Only variance
23) A right-skewed distribution has a tail on?
A. Left side
B. Right side
C. Both sides equally
D. No tail
24) Central Limit Theorem states?
A. Samples are always equal
B. Sample means approach normal distribution as sample size increases
C. All data becomes uniform
D. Variance becomes zero
25) Which distribution is best for modeling number of successes in n trials?
A. Exponential
B. Binomial
C. Normal only
D. Uniform
Answer Key
1) B
2) B
3) B
4) C
5) B
6) B
7) B
8) A
9) B
10) A
11) B
12) B
13) A
14) A
15) A
16) A
17) A
18) A
19) B
20) A
21) B
22) A
23) B
24) B
25) B