In 2008 a small dealership leased 21 Suburu Outbacks on 2yea

In 2008, a small dealership leased 21 Suburu Outbacks on 2-year leases. When the cars were returned in 2010, the mileage was recorded (see below).

15.

value:
1.42 points

Is the dealer\'s mean significantly greater than the national average for 2-year leases is 30,291 miles. Using the 25 percent level of significance. Choose the appropriate hypothesis.

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16.

value:
1.42 points

Solution

Null Hyp: The dealer\'s mean is significantly lesser than or equal to the national average for 2-year leases

H₀: mu <= 30291

Alt Hyp: The dealer\'s mean is significantly greater than the national average for 2-year leases

H₁: mu > 30291

Degrees of freedom = n - 1 = 20

alpha = 0.10

Critical value = 1.325

H₀: ? <= 30,291, reject H₀ if t_calc > 1.325

b) sample mean = 33924.14

sample stdev = 11833.37

Test stat = (33924.14 - 30291)/(11833.14/21^.5)) = 1.407