Random variables defined via the distr package.

How many main functions does the tidyr package provide for tidying messy data?

Which of the following statements is used to explicitly control looping?

What will be the output of the code?

> m <- matrix(nrow = 2, ncol = 3)
> dim(m)

Each margin of a figure is considered to have a number of

Which of the following functions is used to plot multiple histograms?

All columns in a matrix must have the same mode and the same length.

Which of the following sorts a data frame by the order of the elements in column B?

In the formula lm(response ~ terms), the terms specification of the form "first*second" is the same as which of the following?

Which of the following code creates n samples of size "size" with probability "prob" from the binomial distribution?