This is pretty clearly a homework question and this list does not do people's homework for them.
You need to learn more about the basics of R syntax. Read "An Introduction to R", readily available from the R web site.
cheers, Rolf Turner -- Technical Editor ANZJS Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276 On 11/09/15 22:53, massmatics wrote:
So this is the question that I need help on. :( 4.) ‘Warpbreaks’ is a built-in dataset in R. Load it using the function **data(warpbreaks)**. It consists of the number of warp breaks per loom, where a loom corresponds to a fixed length of yarn. It has three variables namely, breaks, wool, and tension. a.) Write a code (Hint: a logical expression) that extracts the observations with wool type A and tension level M. Assign it to the object **AM.warpbreaks**. b.) For the ‘AM.warpbreaks’ dataset, compute for the mean and the standard deviation of the breaks variable for those observations with **breaks value not exceeding 30**. My code for 4a) (However, it didn't work. Can somebody help me how to solve this problem?) :(warpbreak <- data(warpbreaks("breaks", "wool", "tension"))AM.warpbreaks <- c('','type A','level M')
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