A.

One can be 90 % confident that the mean drive-through service time of this fast-food chain is between 166.6 seconds and 170.0 seconds.

B.

The mean drive-through service time of this fast-food chain is 168.3 seconds 90 % of the time.

C.

One can be 90 % confident that the mean drive-through service time of this fast-food chain is 168.3 seconds.

D.

There is a 90 % probability that the mean drive-through service time of this fast-food chain is between 166.6 seconds and 170.0 seconds.

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