It is claimed that the mean length of time car owners keep their car is 7.5 years. When 100 randomly selected car owners are polled, it is found that the mean length of time they plan to keep their...

It is claimed that the mean length of time car owners keep their car is 7.5 years. When 100 randomly selected car owners are polled, it is found that the mean length of time they plan to keep their car is 7.01 years, with a standard deviation of 3.74. At a 1 % level of significance, test if car owners now keep their car for less time.

Jun 02, 2022

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