Free Data Science MCQ Question and Answers

Question 1

Which of the subsequent functions is used to calculate quantiles for numerical values?

Accepted Answer

quantile

Answer

In many statistical programming languages and libraries, such as R or Python's NumPy/Pandas, the `quantile()` function is used to calculate quantiles for numerical values. Quantiles divide a dataset into equal-sized contiguous subgroups, allowing you to determine values below which a certain percentage of data falls, like the median (0.5 quantile) or quartiles.

Question 2

Which of the subsequent functions is utilized for flat file loading?

Accepted Answer

read.table

Answer

In R, `read.table()` is a versatile and commonly used function for loading data from flat files (plain text files) into a data frame. It can handle various delimiters, specify whether a header is present, and infer data types, making it a primary tool for importing structured data from external text sources.

Question 3

How does the genetic algorithm create new states?

Accepted Answer

Both Mutation & Cross-over

Answer

Genetic algorithms, inspired by biological evolution, create new candidate solutions (states) primarily through two operators: crossover and mutation. Crossover combines genetic material from two parent solutions to produce offspring, while mutation introduces random changes to individual solutions. These mechanisms ensure diversity in the population and enable exploration of the search space to find optimal solutions.

Question 4

Indicate which of the following is true.

Accepted Answer

None of the above

Answer

The `head()` and `tail()` functions in data analysis environments (like R or Python's Pandas) are designed to display the beginning or end of data structures such as data frames, vectors, or lists. They are not typically used to operate directly on raw string literals. Therefore, none of the given statements accurately describe their functionality with respect to strings.

Question 5

The LISP processor performs the following when a top-level function is entered:

Accepted Answer

It prints the result returned by the function

Answer

When a top-level function is entered into a LISP (or Scheme) processor, it typically operates within a Read-Eval-Print Loop (REPL). After the function is read and then evaluated, the final step in this loop is for the processor to print the result returned by that function to the console. This immediate feedback is characteristic of interactive LISP environments.

Data Science Practice Test

Data Science Practice Test

Free Data Science MCQ Question and Answers