Low-level plotting functions that add elements to an existing plot.

Which of the following functions works similarly to separate()?

 dplyr can be integrated with the ________ package for large fast tables. 

What would be the output of the following code

> x <- 1:4

> y <- 6:9

> z <- x + y

> z

You can check to see whether an R object is NULL using the _________ function.

What is the output of the following R code?

x <- 0:6
as.logical(x)

​which of the following is invalid?

Pick the correct output.

 

> a <- data.frame(x = rnorm(100), y = runif(100))
> b <- c(3, 4.4, 1 / 3)

Which of the following statements is used to generate a normal distribution?