The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 502 customers in Taco Bell's drive-through has a lower bound of 162.2 seconds and an upper bound of 167.2 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 502 customers? The mean service time from the 502 customers is (Type an integer or a decimal. Do not round.) seconds ←
The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 502 customers in Taco Bell's drive-through has a lower bound of 162.2 seconds and an upper bound of 167.2 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 502 customers? The mean service time from the 502 customers is (Type an integer or a decimal. Do not round.) seconds ←
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:The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 502
customers in Taco Bell's drive-through has a lower bound of 162.2 seconds and an upper bound of 167.2 seconds. Complete parts (a) through (c).
(a) What is the mean service time from the 502 customers?
The mean service time from the 502 customers is seconds
(Type an integer or a decimal. Do not round.)
(...)
Transcribed Image Text:pok
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tes
ity
A simple random sample of size n is drawn. The sample mean, x, is found to be 18.5, and the sample standard deviation, s, is found to be 4.7.
Click the icon to view the table of areas under the t-distribution.
(a) Construct a 95% confidence interval about u if the sample size, n, is 35.
Lower bound: 16.89; Upper bound: 20.11
(Use ascending order. Round to two decimal places as needed.)
(b) Construct a 95% confidence interval about u if the sample size, n, is 61.
Lower bound:: Upper bound:
(Use ascending order. Round to two decimal places as needed.)
Tutoring
Table of t-Distribution Areas
df
1
2
(...)
0.10
0.25 0.20 0.15
0.05
1.000 1.376 1.963 3.078 6.314
0.816 1.061 1.386 1.886 2.920
0.025
0.005 0.0025
12.706 15.894 31.821 63.657 127.321 318.309
4.303 4.849 6.965 9.925 14.089 22.327
0.02
0.01
0.001
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