Question: A Roper poll used a sample of 100 randomly selected car owners. Within the sample, the mean time of ownership for a single car was

A Roper poll used a sample of 100 randomly selected car owners. Within the sample, the mean time of ownership for a single car was 7.01 years with a standard deviation of 3.74 years. Test the claim by the owner of a large dealership that the mean time of ownership for all cars is less than 7.5 years.

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