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February 9, 2018

The Scottsdale fire department
The Scottsdale fire department aims to respond to fire calls in 4 minutes or less, on average. State the hypotheses you would use if you had reason to believe that the fire department’s claim is not being met. Hint: Remember that sample data are used as evidence against the null, not to prove the null is true.
9.8 The average age of a part time seasonal employee at a Vail Resorts ski mountain has historically been 37 years. State the hypotheses one would use to test if this average has decreased since the last season.
9.9 Sketch a diagram of the decision rule for each pair of hypotheses.
a. H0: µ = 80 versus H1: µ 80
b. H0: µ = 80 versus H1: µ /= 80
c. H0: µ = 80 versus H1: µ > 80

 

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