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Welcome to the Commands and Packages MCQs Page

Dive deep into the fascinating world of Commands and Packages with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Commands and Packages, a crucial aspect of R Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Commands and Packages, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within R Programming.

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Check out the MCQs below to embark on an enriching journey through Commands and Packages. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of R Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Commands and Packages. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Commands and Packages MCQs | Page 3 of 8

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Q21.
Which of the following will reverse the order of values in x?

a.

rev(x)

b.

max(x, na.rm=TRUE)

c.

all(x)

d.

x%in%y

Discuss
Answer: (a).rev(x)
Q22.
Which of the following finds row sums for each level of a grouping variable?

a.

rowSums (x, na.rm = FALSE, dims = 1)

b.

colMeans(x, na.rm = FALSE, dims = 1)

c.

rowMeans(x, na.rm = FALSE, dims = 1)

d.

rowsum(x, group, reorder = TRUE, …)

Discuss
Answer: (c).rowMeans(x, na.rm = FALSE, dims = 1)
Q23.
Which of the following statement applies the function (FUN) to either rows (1) or columns (2) on object X?

a.

apply(x,1,min)

b.

apply(x,2,max)

c.

col.max(x)

d.

apply(X, MARGIN, FUN, …)

Discuss
Answer: (d).apply(X, MARGIN, FUN, …)
Q24.
Which of the following statement finds the maximum for each column?

a.

apply(x,2,max)

b.

col.max(x)

c.

which.min(x)

d.

which.max(x)

Discuss
Answer: (a).apply(x,2,max)
Q25.
Which of the following statement tells the row with the minimum value for every column?

a.

which.min(x)

b.

which.max(x)

c.

z=apply(x,1,which.min)

d.

z=apply(1,1,which.max)

Discuss
Answer: (a).which.min(x)
Q26.
Which of the following may be used for linear regression?

a.

X %*% Y

b.

solve(A)

c.

solve(A,B)

d.

X $*$ Y

Discuss
Answer: (c).solve(A,B)
Q27.
Which of the following sets the size of the outer margins for the graph?

a.

par(mfrow=c(nrow,mcol))

b.

par(ask=TRUE)

c.

par(omi=c(0,0,1,0) )

d.

par(ask=False)

Discuss
Answer: (c).par(omi=c(0,0,1,0) )
Q28.
Which of the following function is used for plotting histogram?

a.

hist()

b.

histog()

c.

histg()

d.

histo()

Discuss
Answer: (a).hist()
Q29.
Which of the following will add the title “R language” to the graph?

a.

titleAdd( “R language”)

b.

title( “R language”)

c.

titleBar( “R language”)

d.

var(x, na.rm=TRUE)

Discuss
Answer: (b).title( “R language”)
Q30.
______ let’s you perform SQL queries on your R data frames.

a.

sqldf

b.

plyr

c.

forecast

d.

daply

Discuss
Answer: (b).plyr
Page 3 of 8

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