bound of 170.2 seconds and an upper bound of 174.6 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 582 customers? The mean service time from the 582 customers is 172.4 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 is 2.2 seconds. (Type an integer or a decimal. Do not round.) (c) Interpret the confidence interval. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals. Do not round.) OA. One can be % confident that the mean drive-through service time of Taco Bell is between seconds. OB. The mean drive-through service time of Taco Bell is OC. There is a seconds. OD. One can be seconds % of the time. probability that the mean drive-through service time of Taco Bell is between % confident that the mean drive-through service time of Taco Bell is seconds and seconds and seconds.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 99%
confidence interval that results from examining 582 customers in Taco Bell's drive-through has a lower
bound of 170.2 seconds and an upper bound of 174.6 seconds. Complete parts (a) through (c).
(a) What is the mean service time from the 582 customers?
The mean service time from the 582 customers is 172.4 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 is 2.2 seconds.
(Type an integer or a decimal. Do not round.)
(c) Interpret the confidence interval.
Select the correct choice below and fill in the answer boxes to complete your choice.
(Type integers or decimals. Do not round.)
O A. One can be % confident that the mean drive-through service time of Taco Bell is between
seconds.
OB. The mean drive-through service time of Taco Bell is
seconds % of the time.
OC. There is a % probability that the mean drive-through service time of Taco Bell is between
seconds.
D. One can be
% confident that the mean drive-through service time of Taco Bell is
seconds and
seconds and
seconds.
Transcribed Image Text:The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 99% confidence interval that results from examining 582 customers in Taco Bell's drive-through has a lower bound of 170.2 seconds and an upper bound of 174.6 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 582 customers? The mean service time from the 582 customers is 172.4 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 is 2.2 seconds. (Type an integer or a decimal. Do not round.) (c) Interpret the confidence interval. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals. Do not round.) O A. One can be % confident that the mean drive-through service time of Taco Bell is between seconds. OB. The mean drive-through service time of Taco Bell is seconds % of the time. OC. There is a % probability that the mean drive-through service time of Taco Bell is between seconds. D. One can be % confident that the mean drive-through service time of Taco Bell is seconds and seconds and seconds.
Expert Solution
Step 1: We have given that

Given:

Confidence level = 99%

n = 582

Confidence interval = (170.2,  174.6)

Formula Used:

Margin space of space error space equals space fraction numerator upper space limit space minus space Lower space limit over denominator 2 end fraction

Mean space equals space Lower space limit space thin space plus space Margin space of space error

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