Dell Data Science Foundations
Domain 3Objective 1
Explain How Basic R Commands Are Used to Initially Explore and Analyze the Data DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 3)
Part of the Initial Analysis of the Data domain, which accounts for 15% of the DATA-SCIENCE-FOUNDATIONS exam.
24questions here
5free pages
7concepts
15%of the exam
Questions 11–15
- 11
A data analyst loads a CSV file into R as a data frame named `sales`. They need a quick overview that shows the data types of each column, the number of rows, and a preview of the first few values. Which single R command accomplishes this?
Select an answer first - 12
Which R function computes the arithmetic average of a numeric vector?
Select an answer first - 13
Which R function displays the first few rows of a data frame to give a quick preview of the data?
Select an answer first - 14
An analyst wants to explore the distribution of a numeric variable `price` in a data frame `products`. They suspect the data may be skewed and want to see the shape of the distribution. Which R command is most appropriate for this initial exploration?
Select an answer first - 15
Which R data structure is specifically designed to represent categorical data with a fixed set of possible values?
Select an answer first
Finished these 5 questions?
Review the revealed explanations, or continue through the curriculum.
Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Dell Technologies. “DATA-SCIENCE-FOUNDATIONS” is a trademark of its owner, used for identification only.