Data Science Questions and Answers – Probability and Statistics

This set of Data Science Multiple Choice Questions & Answers (MCQs) focuses on “Probability and Statistics”.

1. The expected value or _______ of a random variable is the center of its distribution.
a) mode
b) median
c) mean
d) bayesian inference
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2. Point out the correct statement.
a) Some cumulative distribution function F is non-decreasing and right-continuous
b) Every cumulative distribution function F is decreasing and right-continuous
c) Every cumulative distribution function F is increasing and left-continuous
d) None of the mentioned
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3. Which of the following of a random variable is a measure of spread?
a) variance
b) standard deviation
c) empirical mean
d) all of the mentioned
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4. The square root of the variance is called the ________ deviation.
a) empirical
b) mean
c) continuous
d) standard
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5. Point out the wrong statement.
a) A percentile is simply a quantile with expressed as a percent
b) There are two types of random variable
c) R cannot approximate quantiles for you for common distributions
d) None of the mentioned
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6. Which of the following inequality is useful for interpreting variances?
a) Chebyshev
b) Stautaory
c) Testory
d) All of the mentioned
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7. For continuous random variables, the CDF is the derivative of the PDF.
a) True
b) False
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8. Chebyshev’s inequality states that the probability of a “Six Sigma” event is less than ___________
a) 10%
b) 20%
c) 30%
d) 3%
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9. Which of the following random variables are the default model for random samples?
a) iid
b) id
c) pmd
d) all of the mentioned
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10. Cumulative distribution functions are used to specify the distribution of multivariate random variables.
a) True
b) False
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