Sample random

Session II 2021/STAT 2340/E1 / Section 5 / STAT2340 Final Exam spring 2021 A manufacture of Mobile wants to estimate the average repair cost per month for the mobile he has sold to certain industries. He decided to use cluster sampling with each industry as cluster and select a simple random sample of industries from 96 industries he services. The data on total cost repair per industry and number of mobile per industr are given in the following table Industry Number of mobile (mi) Total repair cost (in RO) (yn) 5 20 2 4 12 3 6 12 4 8 21 5 6 15 i) Estimate the average repair cost for a month and place a bound on the error of estimation i) How many clusters should be selected if you want the bound on the error of estimation to be less than RO 2? A BI SX'S