Test Your R Skills with This 10 Question Intermediate Quiz

Quiz 3

Beginner Level

⭐️ Test your R skills with this 10 question intermediate quiz! ⭐️

It covers key abilities like:

- Building dataframes and matrices
- Data vis with ggplot2
- Writing functions
- Statistical modeling

Take this quiz to check you can:

- Wrangle data into tidy formats
- Create plots for exploration
- Build models like regression
- Write reusable R functions

Brush up on intermediate concepts crucial for analytics and data science!

1 / 10

In R, what is the difference between a dataframe and a matrix?

A dataframe can hold different data types, a matrix must have all the same type

A matrix can have column names, a dataframe cannot.

Nothing, they are the same thing in R.

A dataframe is 1D, a matrix is 2D.

2 / 10

. What ggplot2 layer controls the color of points on a scatterplot?

geom_point()

scale_color_manual()

aes(color=)

color()

3 / 10

How do you write a function in R that prints the square of a number?

square <- fun(x) { print(x^2) }

fun square(x) { x^2 }

square <- function(x) { print(x^2) }

func square(number) print(number^2)

4 / 10

What R data structure is most similar to a Python dictionary?

Dataframe

List

Array

Vector

5 / 10

. Which tidyverse package has functions like separate() to manipulate strings?

purrrr

readr

dplyr

6 / 10

How do you create a histogram of the column var in dataframe df?

hist(df$var)

plot(histogram(df, var))

ggplot(df, aes(var)) + geom_histogram()

histogram(df, var)

7 / 10

. What R command runs a linear regression model on y ~ x?

regression(y ~ x)

linear_reg(y ~ x)

lm(y ~ x)

linearModel(y ~ x)

8 / 10

The merge() function in R joins dataframes based on which columns?

The row names

The index column

Specified key columns

All their columns

9 / 10

What type of R plot visualizes the density of a continuous variable?

Histogram

Bar chart

Density plot

Pie chart

10 / 10

Which function adds rows of data to an existing dataframe df?

cbind()

rbind()

bind_rows()

merge()

Your score is

The average score is 0%

0%

10 Question Intermediate Quiz to Test Your R Skills

Submit a Comment Cancel reply

Quick Links