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A trade magazine routinely checks the drive-through service times of fast-food restaurants. an 80% confidence interval that results from examining 552 customers in one fast-food chain's drive-through has a lower bound of 172.3 seconds and an upper bound of 175.5 seconds. what does this mean?

Respuesta :

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An 80% confidence interval means that of the surveyed customers, 80% (or 442) spent between 172.3 and 175.5 seconds in the drivethrough.

Answer:

80% sure that the true mean waiting time for all customers in one fast-food chain's drive through is between 172.3 seconds and 175.5 seconds.

Explanation:

A x% confidence interval of a sample being (a,b) means that we are x% sure that the true mean of the population is between a and b.

In this problem, we have that:

80% confidence interval that results from examining 552 customers in one fast-food chain's drive-through has a lower bound of 172.3 seconds and an upper bound of 175.5

This means that we are 80% sure that the true mean waiting time for all customers in one fast-food chain's drive through is between 172.3 seconds and 175.5 seconds.

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