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A poll of 50 randomly selected car owners revealed that the mean length of time they...

A poll of 50 randomly selected car owners revealed that the mean length of time they plan to keep their car is 7.01 years with a standard deviation of 3.74 years. At the 0.05 significance level, test the claim that the mean for all car owners is less than 7.5 years. Use the sample standard deviation for σ.

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orchestra answered 2 years ago
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