A trade magazine routinely checks the drive-through service times of fast-food restaurants. An 80 % confidence interval that results from examining 576 customers in one fast-food chain's drive-through has a lower bound of 178.0 seconds and an upper bound of 181.0 seconds. What does this mean?

Question

Mathematics

Jonathan Lewis

28 February, 18:15

A trade magazine routinely checks the drive-through service times of fast-food restaurants. An 80 % confidence interval that results from examining 576 customers in one fast-food chain's drive-through has a lower bound of 178.0 seconds and an upper bound of 181.0 seconds. What does this mean?

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Answers (2)

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Natalie Solis · Answer 1

This means that we are 80% confident that the mean of the drive-through service time is between 178.0 seconds and 181.0 seconds. This conclusion was obtained after examined 576 customers. If you want a greater % of confidence you will have to lower the lower bound and increase the upper bound

Luka · Answer 2

This means that we are 80% confident that the mean drive - through service time of fast food service is between 178.0 seconds and 181.0 seconds

Step-by-step explanation:

A confidence Interval tells us that where the true value of parameter lies with certain confidence, It has a lower limit and an upper limit in this case it means with a confidence of 80% the mean drive - through service time of fast food service is between 178.0 seconds and 181.0 seconds