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It is claimed that automobiles are driven on average more than 20,000 kilometers per year. To...

It is claimed that automobiles are driven on
average more than 20,000 kilometers per year. To test
this claim, 100 randomly selected automobile owners
are asked to keep a record of the kilometers they travel.
Would you agree with this claim if the random sample
showed an average of 23,500 kilometers and a standard
deviation of 3900 kilometers? Use a P-value in your
conclusion.

but construct a 99% confidence interval

Math   Statistics-And-Probability   
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