Code chunks and output in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the number 5.

R Programming

print([1])

Drag options to blanks, or click blank then click option'

Afive

Bx

C"5"

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around 5 prints it as text, not number.

Using a variable name without defining it causes an error.

The print() function outputs the value inside the parentheses. Using 5 prints the number 5.

2fill in blank

medium

Complete the code to assign the value 10 to variable x.

R Programming

[1] <- 10

Drag options to blanks, or click blank then click option'

Ay

Bx

C10

Dprint(x)

Attempts:

3 left

💡 Hint

Common Mistakes

Using the value 10 on the left side instead of variable name.

Using print instead of variable name causes syntax error.

In R, the assignment operator <- assigns the value on the right to the variable on the left. Here, x is the variable name.

3fill in blank

hard

Fix the error in the code to calculate the sum of 3 and 4.

R Programming

result <- 3 [1] 4

Drag options to blanks, or click blank then click option'

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using minus or other operators changes the result.

Leaving the operator blank causes syntax error.

The plus sign + adds two numbers. Using it here sums 3 and 4 correctly.

4fill in blank

hard

Fill both blanks to create a vector of numbers from 1 to 5.

R Programming

numbers <- c([1]:[2])

Drag options to blanks, or click blank then click option'

A1

Bc

C5

Dseq

Attempts:

3 left

💡 Hint

Common Mistakes

Using function names instead of numbers inside the colon.

Swapping the numbers changes the sequence.

The colon operator : creates a sequence from the first number to the second. Here, 1:5 makes numbers 1 through 5.

5fill in blank

hard

Fill all three blanks to create a named vector with scores greater than 50.

R Programming

scores <- c(Alice=60, Bob=45, Carol=75)
passed <- scores[scores [1] [2]]
result <- [3](names(passed))

Drag options to blanks, or click blank then click option'

A>

B50

Csort

Dmean

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators like < or =.

Using mean() instead of sort() for names.

This code selects scores greater than 50 using > and 50. Then it gets the names of those who passed and sorts them with sort().