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Katie thinks that people living in a rural environment have a healthier lifestyle than other people....

Katie thinks that people living in a rural environment have a healthier lifestyle than other people. She believes the average lifespan in the USA is 77 years. A random sample of 18 obituaries from newspapers from rural towns in Idaho give ?¯=80.01 and ?=0.7. Does this sample provide evidence that people living in rural Idaho communities live longer than 77 years? (a) State the null and alternative hypotheses: (Type "mu" for the symbol ?μ , e.g. mu >1 for the mean is greater than 1, mu < 1 for the mean is less than 1, mu not = 1 for the mean is not equal to

1) ?0 :

?? :

(b) Find the test statistic, t =

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