# FREE Data Science Trivia Question and Answers

#### What one of the following qualifies as a random variable?

#### One of the fundamental skills in data science is which of the following?

Since building models from data using machine learning methods and algorithms necessitates them, ML has grown to be the most prominent component of the modern data scientist's job. Data scientists must be familiar with the wide variety of ML methods.

#### The weighted average is employed in:

Based on an item's historical performance and a certain "weight" or emphasis, the Weighted Average Forecasting approach calculates how much inventory to maintain on hand. For goods that consistently sell and had sales in at least 8 of the previous 12 periods, the formula is effective.

#### Which of the following is a measure of spread for a random variable?

The spread of the distribution is quantified by the standard deviation (). The standard deviation increases as the spread widen. For a discrete set of data, the standard deviation is calculated using the square root of variance.

#### The purpose of machine learning in data science

High-value forecasts that may direct better judgments and smarter actions in real-time without human intervention are one essential reason why data scientists need machine learning.

#### Which of the subsequent tests is focused on using data to make decisions?

It is common to refer to a hypothesis as a "educated guess" about a certain parameter or population. After it has been defined, information can be obtained to see whether it offers enough proof to back up the hypothesis.