1 of 1 STAT-341 Home work 3 Please submit your solutions by Thursday, 23rd December 2021. Show all work. 8.2 A manufacturer of band saws wants to estimate the average repair cost per month for the saws he has sold to certain industries. He cannot obtain a repair cost for each saw, but he can obtain the total amount spent for saw repairs and the number of saws owned by cach industry. Thus, he decides to use cluster sampling, with each industry as a cluster. The manufacturer selects a simple random sample of a 20 from the N 96 industries he services. The data on total cost of repairs per industry and number of saws per industry are as given in the accompanying table. Estimate the average repair cost per saw for the past month and place a bound on the error of estimation. Number of saws Total repair cost for past month (dollars) Industry 50 110 230 140 60 280 12 14 240 45 60 230 140 10 12 130 13 70 50 14 15 16 17 10 60 280 150 18 19 110 20 120 8.3 For the data in Exercise 8.2, estimate the total amount spent by the 96 industries on band saw repairs. Place a bound on the error of estimation. 8.4 After checking his sales records, the manufacturer in Exercise 8.2 finds that he sold a total of 710 band saws to these industries. Using this additional information, estimate the total amount spent on saw repairs by these industries and place a bound on the error of estimation. 8.5 The same manufacturer (Exercise 8.2) wants to estimate the average repair cost per saw for next month. How many clusters should he select for his sample if he wants the bound on the error of estimation to be less than $27 STSATM/16 12 202AIWA
1 of 1 STAT-341 Home work 3 Please submit your solutions by Thursday, 23rd December 2021. Show all work. 8.2 A manufacturer of band saws wants to estimate the average repair cost per month for the saws he has sold to certain industries. He cannot obtain a repair cost for each saw, but he can obtain the total amount spent for saw repairs and the number of saws owned by cach industry. Thus, he decides to use cluster sampling, with each industry as a cluster. The manufacturer selects a simple random sample of a 20 from the N 96 industries he services. The data on total cost of repairs per industry and number of saws per industry are as given in the accompanying table. Estimate the average repair cost per saw for the past month and place a bound on the error of estimation. Number of saws Total repair cost for past month (dollars) Industry 50 110 230 140 60 280 12 14 240 45 60 230 140 10 12 130 13 70 50 14 15 16 17 10 60 280 150 18 19 110 20 120 8.3 For the data in Exercise 8.2, estimate the total amount spent by the 96 industries on band saw repairs. Place a bound on the error of estimation. 8.4 After checking his sales records, the manufacturer in Exercise 8.2 finds that he sold a total of 710 band saws to these industries. Using this additional information, estimate the total amount spent on saw repairs by these industries and place a bound on the error of estimation. 8.5 The same manufacturer (Exercise 8.2) wants to estimate the average repair cost per saw for next month. How many clusters should he select for his sample if he wants the bound on the error of estimation to be less than $27 STSATM/16 12 202AIWA
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Solve (8.4)
Transcribed Image Text:5:16
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Done STAT341HW3(16122021)_121b45...
1 of 1
STAT-341 Home work 3
Please submit your solutions by Thursday, 23rd December 2021.
Show all work.
8.2 A manufacturer of band saws wants to estimate the average repair cost per month for the
saws he has sold to certain industries. He cannot obtain a repair cost for each saw, but he
can obtain the total amount spet for saw repairs and the number of saws owned by each
industry. Thus, he decides to use cluster sampling, with each industry as a cluster. The
manufacturer selects a simple random sample of n= 20 from the N= 96 industries he
services. The data on total cost of repairs per industry and number of saws per industry
are as given in the accompanying table. Estimate the average repair cost per saw for the
past month and place a bound on the error of estimation.
Number
Total repair cost for
past month (dollars)
Industry
of saws
3.
50
110
3
11
230
140
2
60
12
280
240
45
14
3
60
10
230
11
12
140
130
13
3.
70
14
50
15
10
16
4
60
17
12
280
150
18
19
20
110
120
8.3 For the data in Exercise 8.2, estimate the total amount spent by the 96 industries on band
saw repairs. Place a bound on the error of estimation.
After checking his sales records, the manufacturer in Exercise 8.2 finds that he sold a total of
710 band saws to these industries. Using this additional information, estimate the total
amount spent on saw repairs by these industries and place a bound on the error of estimation.
8.4
8.5 The same manufacturer (Exercise 8.2) wants to estimate the average repair cost per saw
for next month. How many clusters should he select for his sample if he wants the bound
on the error of estimation to be less than $2?
STSAT341/16.12.2021/HW3
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