R Programming MCQ Questions with answers and solutions Page 61

Q. What is the output of the following R code: for (i in 1:5) { if (i %% 2 == 0) { print(i) } }

(A) 2
(B) 4
(C) 2, 4
(D) 1, 3, 5

💬 Discuss

✅ Correct Answer: (C) 2, 4

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. In R, what is the purpose of the repeat loop combined with break?

(A) To create an infinite loop
(B) To repeat a block of code until a certain condition is met
(C) To skip the current iteration of the loop
(D) To exit the loop immediately

💬 Discuss

✅ Correct Answer: (D) To exit the loop immediately

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. How is the switch() function different from if-else in R?

(A) switch() is used for multiple conditions, if-else for two conditions
(B) switch() can only handle numeric values, if-else can handle any type
(C) if-else can only handle numeric values, switch() can handle any type
(D) Both switch() and if-else are used interchangeably

💬 Discuss

✅ Correct Answer: (A) switch() is used for multiple conditions, if-else for two conditions

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. What is the role of the next statement in a loop in R?

(A) To skip the next condition in an if-else statement
(B) To exit the loop immediately
(C) To move to the next iteration of the loop
(D) To restart the loop from the beginning

💬 Discuss

✅ Correct Answer: (C) To move to the next iteration of the loop

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. In R, what does the repeat loop combined with next do?

(A) Repeats a block of code indefinitely and skips to the next iteration when a condition is met
(B) Repeats a block of code a specified number of times and exits the loop immediately
(C) Repeats a block of code a specified number of times and skips to the next iteration
(D) Repeats a block of code indefinitely and exits the loop immediately

💬 Discuss

✅ Correct Answer: (C) Repeats a block of code a specified number of times and skips to the next iteration

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. What is the role of exploratory graphs in data analysis?

(A) They are made for formal presentations
(B) They are typically made very quickly
(C) Axes, legends, and other details are clean and exactly detailed
(D) They are used in place of formal modeling

💬 Discuss

✅ Correct Answer: (B) They are typically made very quickly

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. . . . . . . . . evaluate the cumulative distribution function for a Normal distribution.

(A) dnorm
(B) rnorm
(C) pnorm
(D) rpois

💬 Discuss

✅ Correct Answer: (C) pnorm

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. What will be the output of the following R code?
> set.seed(20)
> x <- rnorm(100)
> e <- rnorm(100, 0, 2)
> y <- 0.5 + 2 * x + e
> summary(y)

(A) Min. 1st Qu. Median Mean 3rd Qu. Max. -6.4080 -1.5400 0.6789 0.6893 2.9300 6.5050
(B) Min. 1st Qu. Median Mean 3rd Qu. Max. -6.4080 -10.5400 0.6789 5.6893 2.9300 6.5050
(C) Min. 1st Qu. Median Mean 3rd Qu. Max. -1.4080 -6.5400 0.6789 0.6893 2.9300 6.5050
(D) Error

💬 Discuss

✅ Correct Answer: (A) Min. 1st Qu. Median Mean 3rd Qu. Max. -6.4080 -1.5400 0.6789 0.6893 2.9300 6.5050

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. . . . . . . . . describe the type of plot you will produce.

(A) geoms
(B) ggplot
(C) fplot
(D) gplot

💬 Discuss

✅ Correct Answer: (A) geoms

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. . . . . . . . . is used for translating between qplot and base graphics.

(A) translate_qplot_base
(B) translate_qplot_gpl
(C) translate_qplot_lattice
(D) translate_qplot_ggplot

💬 Discuss

✅ Correct Answer: (A) translate_qplot_base

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

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