15 Statistics MCQs for Students and Professionals

Test your knowledge of statistics with these 15 multiple-choice questions. These questions cover a wide range of topics, including central tendency, dispersion, probability, and statistical inference. Whether you are a student or a professional, these MCQs will help you to assess your understanding of statistics.

1-Question: What is the median of the following data set: {10, 15, 20, 25, 30}?

• a) 15
• b) 20
• c) 22.5
• d) 25
• Answer: b) 20

2-Question: In statistics, what does "ANOVA" stand for?

• a) Analysis of Variability
• b) Analysis of Values
• c) Analysis of Variance
• d) Analysis of Means
• Answer: c) Analysis of Variance

3-Question: The mode is the:

• a) Most frequently occurring value
• b) Middle value of the data set
• c) Average of all values
• d) Sum of all values
• Answer: a) Most frequently occurring value

4-Question: What is the range of the data set: {5, 10, 15, 20, 25}?

• a) 15
• b) 20
• c) 25
• d) 20
• Answer: c) 25

5-Question: Which measure of central tendency is most affected by outliers?

• a) Mean
• b) Median
• c) Mode
• d) Range
• Answer: a) Mean

6-Question: The interquartile range (IQR) is a measure of:

• a) Central tendency
• b) Spread or dispersion
• c) Skewness
• d) Variability
• Answer: b) Spread or dispersion

7-Question: In probability, the complement of an event A is denoted as:

• a) A'
• b) A∩B
• c) A∪B
• d) A/B
• Answer: a) A'

8-Question: The standard deviation is the square root of the:

• a) Mean
• b) Variance
• c) Median
• d) Mode
• Answer: b) Variance

9-Question: If the correlation coefficient is -0.8, the relationship between two variables is:

• a) Strongly negative
• b) Strongly positive
• c) Moderately negative
• d) No relationship
• Answer: a) Strongly negative

10-Question: A binomial distribution is characterized by two parameters: n and p. What does 'n' represent?

• a) Mean
• b) Standard deviation
• c) Number of trials
• d) Probability of success
• Answer: c) Number of trials

11-Question: Which of the following is a measure of skewness?

• a) Variance
• b) Standard deviation
• c) Kurtosis
• d) Coefficient of skewness
• Answer: d) Coefficient of skewness

12-Question: A p-value less than the significance level (α) leads to:

• a) Accepting the null hypothesis
• b) Rejecting the null hypothesis
• c) Failing to reject the null hypothesis
• d) Revising the null hypothesis
• Answer: b) Rejecting the null hypothesis

13-Question: The sampling distribution of the sample mean tends to follow a normal distribution as the sample size (n) increases due to:

• a) Central Limit Theorem
• b) Law of Large Numbers
• c) Bayes' Theorem
• d) Chebyshev's Inequality
• Answer: a) Central Limit Theorem

14-Question: A type II error in hypothesis testing occurs when:

• a) The null hypothesis is rejected when it is true
• b) The null hypothesis is accepted when it is false
• c) The sample size is too small
• d) The test statistic is in the critical region
• Answer: b) The null hypothesis is accepted when it is false

15-Question: In regression analysis, the variable being predicted or explained is called the:

• a) Independent variable
• b) Dependent variable
• c) Control variable
• d) Confounding variable
• Answer: b) Dependent variable