01
Which function is used to create a factor in R?
Correct Answer
factor()
☑ MCQ PRACTICE
R Programming Unit 4
Practice objective questions for quick revision and examination preparation. Try answering each question before revealing the answer.
MCQ Practice
R Programming — Unit 4
Practice the following objective questions. Click “Show Answer” whenever you want to check your answer.
02
Factors in R are used to handle _____ data.
Correct Answer
categorical
03
Which function retrieves the levels of a factor?
Correct Answer
levels()
04
What function is commonly used to tabulate the counts of factor levels?
Correct Answer
table()
05
How do you change the order of levels in a factor?
Correct Answer
relevel()
06
Which of the following is NOT a valid operation on factors?
Correct Answer
Summation
07
In R, a table is mainly used to represent:
Correct Answer
Frequency counts
08
Which function is used to create a contingency table?
Correct Answer
xtabs()
09
How do you extract a subtable from a table?
Correct Answer
subset()
10
To find the largest cell value in a table, we use:
Correct Answer
which.max()
11
To get the total number of elements in a table, use:
Correct Answer
sum()
12
How do you find the cumulative sum of a numeric vector?
Correct Answer
cumsum()
13
Which function finds the cumulative product?
Correct Answer
cumprod()
14
What function in R finds the minimum value in a vector or table?
Correct Answer
min()
15
What function finds the maximum value in a set of numbers?
Correct Answer
max()
16
Which function in R is used for integration (basic calculus)?
Correct Answer
integrate()
17
Which function computes the derivative of a function?
Correct Answer
deriv()
18
To calculate probability density for a normal distribution, we use:
Correct Answer
dnorm()
19
Which function generates random numbers from a normal distribution?
Correct Answer
rnorm()
20
What does pnorm() compute?
Correct Answer
Cumulative probability
21
Which function finds the quantile function of a normal distribution?
Correct Answer
qnorm()
22
Which function would you use to find cumulative probabilities for binomial distribution?
Correct Answer
pbinom()
23
What does dbinom() return?
Correct Answer
Probability mass
24
To calculate probabilities for the Poisson distribution, we use:
Correct Answer
dpois()
25
rpois() function is used to:
Correct Answer
Generate random numbers
26
qpois() function in R is used for:
Correct Answer
Quantile calculation
27
The function ppois() returns:
Correct Answer
Cumulative probability
28
Which function would you use to calculate cumulative sum for a table column?
Correct Answer
cumsum()
29
The function to compute the factorial of a number in R is:
Correct Answer
factorial()
30
What function is used to find differences between successive elements?
Correct Answer
diff()