Explore topic-wise MCQs in R Programming.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your R Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

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)
Answer» C. titleBar( R language )
Discussion
2.

Which of the following function is used for plotting histogram?

A. hist()
B. histog()
C. histg()
D. histo()
Answer» B. histog()
Discussion
3.

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)
Answer» D. par(ask=False)
Discussion
4.

Which of the following may be used for linear regression?

A. X %*% Y
B. solve(A)
C. solve(A,B)
D. X $*$ Y
Answer» D. X $*$ Y
Discussion
5.

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)
Answer» B. which.max(x)
Discussion
6.

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)
Answer» B. col.max(x)
Discussion
7.

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, )
Answer» E.
Discussion
8.

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, )
Answer» D. rowsum(x, group, reorder = TRUE, )
Discussion
9.

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
Answer» B. max(x, na.rm=TRUE)
Discussion