Statistics 1 - Correlation and Regression Exam Questions 5 [One sheet of graph paper is provided for use in answering this question.] A biologist assumes that there is a linear relationship between the amount of fertilizer supplied to tomato plants and the subsequent yield of tomatoes obtained. Eight tomato plants, of the same variety, were selected at random and treated, weekly, with a solution in which x grams of fertilizer was dissolved in a fixed quantity of water. The yield. y kilograms, of tomatoes was recorded. Plant A B D E F G H 10 1.5 2.0 25 3.0 3.5 4.0 4.5 3.9 4.4 5.8 6.6 7.0 7.1 7.3 7.7 (a) Plot a scatter diagram of yield, y. against amount of fertilizer. r. (3 marks) (b) Calculate the equation of the least squares regression line of y on r. (6 marks)