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22 February, 19:45

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?

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  1. 22 February, 20:19
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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.
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