STA 304H1F-1003H Winter 2020Assignment 2-Question 3Question 3. ( 13 marks)A certain manufacturing firm produces a product that is packaged under two brand names, formarketing purposes. These two brands serve as strata for estimating potential sales volumefor the next quarter. A SRS of customers for each brand is contacted and asked to providea potential sale figure y (in number of units) for the coming quarter. Last year’s true salesfigure, 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 of120 customers for whom the total sales in the same quater of last year was 24,500 units. Thebrand II sample come from 180 customers with a total quarterly sales last year of 21 200 units.Use R to do the following questions.For each question, report the R code, the R output, and your answer.1(Part 1) (2 m代写STA 304H1F-1003H作业、R编程语言作业调试、代写data作业、R实验作业代做 代做R语言编程|代写留学arks) Find a basic estimate (without auxiliary information) of the total potentialsales. Estimate the variance of your estimator.(Part 2) (6 marks) In this part, use the Separate Ratio Method (SR) to answer(a) (2 marks) Find a ratio estimate of the total potential sales. Estimate the varianceof your estimator.(b) (2 marks) Find a regression estimate of the total potential sales. Estimate thevariance of your estimator.(c) (2 mark) Which of the methods in (Part 1), (Part 2, (a) and (b)) do you recommend?(Part 3) (5 marks) In this part, use the Combined Ratio Estimator Method (CR) to answer thefollowing questions:(a) (2 marks) Find a ratio estimate of the mean potential sales. Estimate the varianceof your estimator.(b) (2 marks) Find a regression estimate of the total potential sales. Estimate thevariance of your estimator.(c) (1 mark) Which of the methods in (Part 1), (Part 3, (a) and (b)) would you suggest?2转自：http://www.daixie0.com/contents/18/4892.html