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R Programming Fundamentals Test
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R Programming Fundamentals Test
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25 Questions

1. What is the value of Y? X <- c(1
2. What's the output for command: is.na(0/0)?
3. Which of the following command only assumes a common continuous distribution?
4. Which R function provides basic descriptive summary statistics for a numeric vector x?
5. What does the option 'cex' do in the following R function? text(0
6. Which R function can be used to produce a simple scatterplot of a numeric vector Y versus a numeric vector X?
7. What's the output for command: paste('O'
8. Which R function will generate a mean for each row in a numeric matrix X with intermittent missing values?
9. Which R function adds a line with slope 1 and intercept 0 into an existing plot of Y versus X?
10. what's the result from following code a = 2; fun = function(x) {a <<- a + 1;return(x + 1)}; z = fun(3); a + z;
11. Which R function provides a histogram of the numeric vector X?
12. Given the command: Z <- array(h
13. What is the value of Y? Y <- 10 + 100 & !is.na(0)
14. In the plot( ) function
15. plot.lm is a function in R
16. What does the following R function output? abs(10 - 3 * 4)
17. Which of the following is NOT one of R's basic vector types?
18. Which of the following is a legal sort command?
19. Which is NOT the right way to quit R program?
20. Given x <- c(1:3
21. What's the output for command is.nan(0/0)
22. Which class avoids making copies of objects?
23. What's the output of the command : x = c(T
24. The command:> state <- c('tas'
25. The entities on which R operates are technically known as:

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