Data Science Trivia 5

Question 1

Which file format is widely used for storing nested, hierarchical data in web APIs?

Accepted Answer

JSON

Answer

JSON stores structured, nested data and is common in web APIs.

Question 2

What is the term for filling in missing data values during preprocessing?

Accepted Answer

Imputation

Answer

Imputation replaces missing values with estimated substitutes.

Question 3

Which metric measures the proportion of correct predictions out of all predictions?

Accepted Answer

Accuracy

Answer

Accuracy is the ratio of correct predictions to total predictions.

Question 4

What scaling technique rescales features to a range between 0 and 1?

Accepted Answer

Min-max normalization

Answer

Min-max normalization rescales values into a fixed 0 to 1 range.

Question 5

Which type of join returns only rows with matching keys in both tables?

Accepted Answer

Inner join

Answer

An inner join returns only the rows present in both tables.

Data Science Practice Test