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 164.7 seconds (Type an integer or a decimal. Do not round.) (b) What is the margin of error for the confidence interval? The margin of error iseconds. (Type an integer or a decimal. Do not round.) C...
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 164.7 seconds (Type an integer or a decimal. Do not round.) (b) What is the margin of error for the confidence interval? The margin of error iseconds. (Type an integer or a decimal. Do not round.) C...
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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Question 1.needs answer b and c
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 164.7 seconds
(Type an integer or a decimal. Do not round.)
(b) What is the margin of error for the confidence interval?
The margin of error iseconds.
(Type an integer or a decimal. Do not round.)
(...)
Transcribed Image Text: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.)
...
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