Need help with this R assignment

QUESTION 1 1 points Save Answer Suppose that S is a vector of univariate data already defined in R. What will the following line of code calculate? sd(S) O the sample standard deviation of S O the population standard deviation of S O the sample variance of S O the sum of squared differences of S QUESTION 2 1 points Save Answer True or False: Let S be a set of univariate data already dened in R. Then the following line of code will always produce a number between -1 and 1. cov(S) 0 True 0 False QUESTION 3 Suppose that S is a data frame already defined in R. Consider the following line of code: x