STA-209 HW 1

From the IMS Textbook, do the following exercises (you do not need to read anything from the textbook to answer these):

• Ch 4.8: #5, #6
• Ch 5.10 #1, #2

Question 1: For this question, we will be using the iris dataset, giving the measurements, in centimeters, of the variables for sepal and petal length and width

To load this data into R, simply copy and paste the following into your Rmd file in an R code chunk

data(iris)

Use this data to answer the following questions:

• Part A How many observations and variables are in the iris dataset? In one sentence, briefly describe what constitutes an observation in this data.
• Part B Create the appropriate plot to visualize the relationship between the variables Sepal.Width and Sepal.Length. Do these two variables appear to be associated? If so, comment on the strength of this association.
• Part C Create the plot again, this time adding an additional aesthetic for the variable Species. Has anything changed in the association between Sepal.Width and Sepal.Length? Comment on the strength, form, and direction of any associations you see.