1 Problem 1 How do length of sepal and species affect the length of petal? Please use the R built-in dataset iris to answer the following questions. 1. How many levels does the variable Species have? 2. Create a boxplot for variables Species and Petal. Length. What are your findings? 3. Fit a simple linear regression model between Species (predictor) and Petal. Length (re- sponse). (a) What is the value of Bi? (b) Explain the meaning of 31. (c) What are the degrees of freedom of the t-test w.r.t B1? 4. (Bonus Question) Fit a multiple linear regression model between Species (predictor), Sepal. Length (predictor), and Petal. Length (response). What are your findings