UPSC Indian Statistical Service (ISS) MCQs
Prepare for the UPSC Indian Statistical Service (ISS) exam with a comprehensive collection of multiple-choice questions (MCQs). These MCQs cover crucial topics such as Statistics, General Studies, and Data Interpretation, aligned with the actual exam pattern. Practicing these questions will help aspirants improve their analytical skills, boost problem-solving abilities, and enhance time management for the exam. Whether you're revising key concepts or testing your knowledge, these ISS MCQs are an invaluable resource for cracking the UPSC Indian Statistical Service exam and securing a prestigious role in India’s statistical agencies.
Q1. What is the mean of the data set: 2, 4, 6, 8, 10?
A. 5
B. 6
C. 7
D. 8
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Q2. The variance of a data set measures:
A. Central tendency
B. Spread of data
C. Skewness
D. Correlation
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Q3. The probability of an impossible event is:
A. 0
B. 0.5
C. 1
D. Cannot be determined
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Q4. Which distribution is called the "bell curve"?
A. Binomial
B. Poisson
C. Normal
D. Exponential
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Q5. Central Limit Theorem describes:
A. Sums of random variables tend to normal distribution
B. Probability of extrema
C. Skewness measurement
D. Dependency of variables
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Q6. Which method is used for estimating population parameters from a sample?
A. Hypothesis testing
B. Estimation
C. Regression analysis
D. Analysis of variance
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Q7. If P(A) = 0.3 and P(B) = 0.4, and events A and B are mutually exclusive, what is P(A or B)?
A. 0.12
B. 0.7
C. 0.1
D. 0.3
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Q8. The median is:
A. Most frequently occurring value
B. Middle value when data is arranged
C. Average of data
D. Variance measure
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Q9. Which test is used to check independence between two categorical variables?
A. ANOVA
B. Chi-square test
C. Z-test
D. T-test
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Q10. The null hypothesis in statistical testing is:
A. What the researcher wants to prove
B. No effect or status quo
C. Alternative to hypothesis
D. True hypothesis
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Q11. In regression analysis, the dependent variable is:
A. Explained variable
B. Predictor variable
C. Independent variable
D. Random variable
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Q12. Which scale of measurement uses categories without order?
A. Interval scale
B. Ratio scale
C. Nominal scale
D. Ordinal scale
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Q13. The purpose of hypothesis testing is to:
A. Accept all theories
B. Make inferences about population
C. Estimate population parameters
D. Find data errors
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Q14. In probability, “independent events” mean:
A. Occurrence of one affects the other
B. Events cannot happen together
C. Occurrence of one does not affect the other
D. Events are mutually exclusive
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Q15. Which graphical representation is best for showing distribution of a quantitative variable?
A. Pie chart
B. Histogram
C. Bar chart
D. Pareto chart
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Q16. Time series analysis is used to:
A. Analyze data over different locations
B. Analyze data over time
C. Analyze categorical data
D. Analyze survey data
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Q17. Which of the following is a measure of central tendency?
A. Variance
B. Skewness
C. Mean
D. Kurtosis
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Q18. “Sampling error” refers to:
A. Errors while collecting data
B. Differences between sample and population
C. Measurement errors
D. Data entry mistakes
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Q19. Which is a non-parametric test?
A. T-test
B. ANOVA
C. Chi-square test
D. Z-test
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Q20. The term “multicollinearity” is associated with:
A. Random errors
B. Correlation between explanatory variables
C. Heteroscedasticity
D. Normality assumption
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