:1:39 SEGEEE A2_STA304H1_Q3_W2020 Question 3. ( 13 marks) A certain manufacturing rm produces a product that is packaged under two brand names, for marketing purposes. These two brands serve as strata for estimating potential sales volume for the next quarter. A SRS of customers for each brand is contacted and asked to provide a potential sale gure y (in number of units) for the coming quarter. Last year's true sales gure, for the same quarter, is available for each of the sampled customers and is denoted by x. The data are given in the accompanying table. The sample for brand I was taken from a list of 120 customers for whom the total sales in the same quater of last year was 24,500 units. The brand II sample come from 180 customers with a total quarterly sales last year of 21 200 units. Brand I Brand II 931' 3% xi yr 204 210 137 150 143 160 189 200 82 75 119 125 256 280 63 60 275 300 103 110 198 190 107 100 159 180 63 75 87 90 Use R to do the following questions. For each question, report the R code, the R output, and your