The following graph is a scatterplot of the Rateprof dataset from the alr4 library we used in the lecture. We wanted to use the clarity rating to predict the overall quality rating of an instructor. There was an unusual observation towards the bottom of the scatterplot. ~ 5- 4 quality 3- 2 - 3 clarity a. The 76th row of the data Rateprof contains the unusual observation. What is the value of its clarity? What is the value of its quality? (1 pt) b. Use the formula to calculate the leverage of the unusual observation . (1 pt) ~ c. Use the R function hatvalues( ) to calculate the leverage of the unusual observation in (b). Is your result consistent with that in (b)? (1 pt)- d. Use the R function cooks.distance( ) to calculate the Cook's Distance of the unusual observation (1 pt) &lt