How to use the R Programming MCQ Quiz
- 1. Choose the length10 random R programming questions, or all 25. Untick shuffle for a fixed order.
- 2. AnswerPick an option and see straight away whether it's right, with a one-line reason.
- 3. See your scoreFinish to get your score and a review of every question with the correct answer.
What the quiz covers
R is widely used in statistics, research and some analytics teams, and this quiz covers what beginners and analyst interviews expect. The 25 questions are grouped into 10 areas, shown above each question: Basics, Types, Vectors, Functions, Data, dplyr, Visualisation, Statistics, Data frames, Tools.
A sample question explained
"What does mean(c(1, NA, 3)) return?" The answer is NA. Use na.rm = TRUE to get 2. Forgetting na.rm = TRUE is one of the most common bugs in R analysis scripts.
More questions you'll meet
A few of the other R programming questions in the bank:
- What does c(1, 2, 3) create?
- What is a factor?
- What represents a missing value in R?
- Which function reads a CSV file?
- Which dplyr verb adds new columns?
- In ggplot2, what does aes() set?
- How do you install a package?
Study tips
- Run each question in RStudio or the console to see the actual output.
- Learn the five main dplyr verbs: filter, select, mutate, arrange and summarise.
- Aim for at least 20 out of 25 on two separate attempts before you treat R programming as revised; one lucky score can hide gaps.
Questions and options are shuffled on each attempt, so a retake is a fresh test. The R programming questions were written by Uncodemy for practice; they aren't copied from any exam or company test.
Frequently asked questions
Base R or tidyverse?
Both. Questions mix base R with dplyr and ggplot2.
Is this for statistics students?
Yes, and for anyone starting data analysis in R.
Is the R programming MCQ quiz free?
Yes. Every question in the R programming MCQ quiz can be answered without signing up. When you finish your first round, we ask once for your name and WhatsApp number to show your score; after that the R programming MCQ quiz and every other Uncodemy tool open straight away.