What's the output for command: seq(from = 1, to = 5, by = 3)

Which R function adds a line with slope 1 and intercept 0 into an existing plot of Y versus X?

What is the output of this command: > is.na( c( 1:3, NA ) )

Suppose we define X <- NA. What is the output for > is.nan( X ); is.na( X )

What is the value of Y? X <- c(1,2,2,2,3,3,4,4,5,6); Y <- unique(X[which(X<4)])

Which function is used to load a CSV file into R?

You accidentally display a large data frame on the R console, losing all the statements you entered during the current session. What is the best way to get the prior 25 statements back?

Which function displays the first five rows of the data frame named pizza?

Which is not a property of lists and vectors?

What is the principal difference between an array and a matrix?

Which choice does R regard as an acceptable name for a variable?