R Quiz
Check your R knowledge with this quiz covering the whole tutorial.
How the Quiz Works
There are ten questions. Choose an answer for each one to see if it is correct, along with a short explanation. If you get one wrong, go back to that lesson and read it again.
| Questions | Topics |
|---|---|
| 1 to 3 | Syntax, variables and data types |
| 4 to 6 | Vectors, lists, matrices and factors |
| 7 to 8 | Data frames |
| 9 to 10 | If else, loops and functions |
Questions
Exercise
1. What does this code print? x <- 7; x %% 3
Exercise
2. What does paste0("Roll-", 25) return?
Exercise
3. What does as.numeric("abc") give?
Exercise
4. If x <- c(4, 8, 15), what is x[2]?
Exercise
5. What does mean(c(2, NA, 6)) return?
Exercise
6. Which structure should you use to count how many customers bought size S, M or L?
Exercise
7. In a data frame df, what does df[3, ] return?
Exercise
8. Which function reads a CSV file into a data frame?
Exercise
9. Which keyword skips the rest of the current loop round and moves to the next item?
Exercise
10. What does this code print? f <- function(a, b = 10) a + b; f(5)
What Next?
Scored 8 or more? You are ready to work with real data. Try the Data Science tutorial next. Scored less? Revisit the lessons on vectors, data frames and functions, then try again.