To answer this question, please refer to the CRAN Packages web page referred to in the course material. Which of these packages are used for Optical Character Recognition? abbyyR Using the iris data set in R, generate a box plot by Species of the variable Petal Length. Using the iris data set in R, generate a box plot by Species of the variable Petal Width. Using the iris data set in R, generate a box plot by Species of the variable Sepal Width. Using the iris data set in R, generate a box plot by Species of the variable Sepal Length. What are the two commands that will return the first and last six rows of a Data Frame? head, tail The R programming language has data sets that are pre-loaded. One of these data sets is the "iris" data set. What command will give you information about this data set? ?iris 1. In the R data set, ChickWeight, calculate the median weight value by Diet. What is the median weight of a chick that has Diet=1 ? 88.0 2. In the R data set, Chick