讲解：STA 304H1F-1003H、R、SR、RDatabase|Haskell

STA 304H1F-1003H Fall 2019Assignment 2-Question 3Question 3. ( 18 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. Please, use the R-output to answer question.The R command should be reported in an eppendix. It worse 2 marks.1(Part 1) (10 marks) Using Separate Ratio Estimator Method (SR)(a) (2 marks) F代写STA 304H1F-1003H、R程序语言调试、SR代ind a basic estimate (without auxiliary information) of the total potentialsales. Estimate the variance of your estimator.(b) (2 marks) Find a ratio estimate of the total potential sales. Estimate the varianceof your estimator.(c) (2 marks) Find a regression estimate of the total potential sales. Estimate thevariance of your estimator.(d) (3 marks) Compute the relative efficiency of(i) ratio estimation to basic estimation(ii) ratio estimation to regression estimation(iii) regression estimation to basic estimation(e) (1 mark) Which method of estimation do you recommend?(Part 2) (6 marks) Using Combined Ratio Estimator Method (CR)(a) (2 marks) Find a basic estimate (without auxiliary information) of the meanpotential sales. Estimate the variance of your estimator.(b) (2 marks) Find a ratio estimate of the mean potential sales. Estimate the varianceof your estimator.(d) (1 mark) Compute the relative efficiency of ratio estimation to basic estimation(e) (1 mark) Which method of estimation do you recommend?2转自：http://www.3daixie.com/contents/11/3444.html