8.3 Why is it not possible in Example 8.1 on page 256 to have 100% confidence? Explain. 8.19 The file Sedans contains the overall miles per gallon (MPG) of 2009 sedans priced under $20.000. XXXXXXXXXX...

1 answer below »
8.3 Why is it not possible in Example 8.1 on page 256 to have 100% confidence? Explain. 8.19 The file Sedans contains the overall miles per gallon (MPG) of 2009 sedans priced under $20.000. 27 31 30 28 27 24 29 32 32 27 26 26 25 26 25 24 Source: Data extracted from “Vehicle Ratings,” Consumer Reports, April 2009, p. 27 Construct a 95% confidence interval estimate for the population mean MPG of 2009 sedans (4 cylinder) priced under $20.000, assuming a normal distribution. Interpret the interval constructed in (a). Compare the results in (a) to those in Problem 8.20 (a) 8.


Document Preview:

8.3 Why is it not possible in Example 8.1 on page 256 to have 100% confidence? Explain. 8.19 The file Sedans contains the overall miles per gallon (MPG) of 2009 sedans priced under $20.000. 27 31 30 28 27 24 29 32 32 27 26 26 25 26 25 24 Source: Data extracted from “Vehicle Ratings,” Consumer Reports, April 2009, p. 27 Construct a 95% confidence interval estimate for the population mean MPG of 2009 sedans (4 cylinder) priced under $20.000, assuming a normal distribution. Interpret the interval constructed in (a). Compare the results in (a) to those in Problem 8.20 (a) 8.22 One of the major measures of the quality of service provided by any organization is the speed with which t responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a major expansion in the past several years. In particular, the flooring department had expanded from 2 installation crews. The store had the business objective of improving its response to complaints. The variable of interest was defined as the number of days between when the complaint was made and when it was resolved. Data were collected from 50 complaints that were made in the last year. The data were stored in Furniture and are as follows: 5453513731271522123817427111912611011029613594312651241653229282926251141313105274523022362620233368 Construct a 95% confidence interval estimate for the population mean number of days between the receipt of a complaint and the resolution of the complaint. What assumption must you make about the population distrubiton in order to construct the confidence interval estimate in (a)? Do you think that the assumption needed in order to construct the confidence interval estimate in (a) is valid? Explain What effect might your conclusion in (c) have on the validity of the results in (a)? 8.23 In New York State, savings banks are permitted to sell a form of life...



Answered Same DayDec 24, 2021

Answer To: 8.3 Why is it not possible in Example 8.1 on page 256 to have 100% confidence? Explain. 8.19 The...

David answered on Dec 24 2021
111 Votes
Question 1 – Exercise 8.3
Why is it not possible in Example 8.1 on page 256 to have 100% confidence? Explain.
Answer
If you have 100% confidence in the value of the calculat
ed mean, then have the true population mean and
the only way to have the true population mean is to use the entire population, which they did not do in
Example 8.1.
Question 2 – Exercise 8.19
The file Sedans contains the overall miles per gallon (MPG) of 2009 sedans priced under $20.000.
27 31 30 28 27 24 29 32 32 27 26 26 25 26 25 24
Source: Data extracted from “Vehicle Ratings,” Consumer Reports, April 2009, p. 27
a) Construct a 95% confidence interval estimate for the population mean MPG of 2009 sedans (4-
cylinder) priced under $20.000, assuming a normal distribution.
b) Interpret the interval constructed in (a).
c) Compare the results in (a) to those in Problem 8.20 (a)
Note: To answer Question 2 – Exercise 8.19 I did Question 2 – Exercise 8.20(a) offline.
Question 2 – Exercise 8.19 is continued on the next page…
Question 2 – Exercise 8.19 (Continued…)
Answer: Part (a)
(


) (


)
Answer: Part (b)
I can be 95% confident that the true population mean of MPG of 2009 sedans (4-cylinder) priced under
$20,000 is between 26.0215 and 28.8535 assuming a normal distribution.
Answer: Part (c)
I can be 95% confident that the true population mean of MPG of 2009 small SUV’s is less than the true
population mean of MPG of 2009 sedans (4-cylinder) priced under $20,000 since the two confidence
intervals do not overlap.
Question 3 – Exercise 8.22
One of the major measures of the quality of service provided by any organization is the speed with which
t responds to customer complaints. A large...
SOLUTION.PDF

Answer To This Question Is Available To Download

Related Questions & Answers

More Questions »

Submit New Assignment

Copy and Paste Your Assignment Here