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A car manufacturer recommends changing the cabin air filter in the vehicle every year. However, a recent study of 254 customers who had their cabin

A car manufacturer recommends changing the cabin air filter in the vehicle every year. However, a recent study of 254 customers who had their cabin air filter replaced revealed a sample mean length of time before replacement of 627 days, with a standard deviation of 155 days.

Construct a 90% confidence interval for the average replacement time for cabin air filters.

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