a. Construct a 95% confidence interval estimate for the population mean number of days between the receipt of a complaint and the resolut The 95% confidence interval estimate is from 28.8 days to 51.8 days. (Round to one decimal place as needed.) b. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
a. Construct a 95% confidence interval estimate for the population mean number of days between the receipt of a complaint and the resolut The 95% confidence interval estimate is from 28.8 days to 51.8 days. (Round to one decimal place as needed.) b. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A large family-held department store had the business objective of improving its response to complaints. The variable of interest was define
between when the complaint was made and when it was resolved. Data were collected from 40 complaints that were made in the last year. U
(a) through (d) below.
E Click the icon to view the data table.
a. Construct a 95% confidence interval estimate for the population mean number of days between the receipt of a complaint and the resolut
The 95% confidence interval estimate is from 28.8 days to 51.8 days.
(Round to one decimal place as needed.)
b. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
OA. The number of complaints per day is normally distributed.
B. The number of complaints per day folaws the t distribution.
OC. The number of days to resolve complaints is normally distributed.
O D. The number of days to resolve complaints follows the t distribution.
Days Between Complaint and Resolution of Complaint
37
90
26
48
43
26
17
103
29
25
152
13
8.
43
18
25
29
118
68
48
3
16
119
63
99
22
22
13
56
10
24
11
47
21
19
48
35
8.
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