Top 50 data Science Interview Questions | Data Science Aptitude Questions Answers

The measure of Dispersion can never be? a. Positive b. Negative c. Zero d. One

A. The measure of dispersion can never be negative. It is never negative since every term in the variance sum is squared and therefore either positive or zero. It has squared units.

The expected value or _______ of a random variable is the center of its distribution. a) mode b) median c) mean d) bayesian inference

A. Mean is generally taken as the center of distribution. So, the answer is c

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

A. Discrete and continuous are the two types of a random variables. A percentile is definitely a quantile. R can approximate quantiles for common distribution

The sum of the percent frequencies for all classes will always equal A. one B. the number of classes C. the number of items in the study D. 100

Ans. The sum of the percent frequencies will always be 100

What is the use of correlation?

Correlation can tell you something about the relationship between variables. It is used to understand:
1. Whether the relationship is positive or negative
2. The strength of the relationship.