5) A car salesman claims that a particular make of car would give a mean mileage
ID: 3440835 • Letter: 5
Question
5) A car salesman claims that a particular make of car would give a mean mileage of greater than 20 miles/gallon. To test the claim, a field experiment was conducted where 10 cars were each run on one gallon of gas. The results (in miles) were: 23, 18, 22, 19, 19, 22, 18, 18, 24, 22. The sample standard deviation (s) = 2.32. What formula would you use to test whether the sample results support the salesman's claim? Use a = .05.
x - t(s ÷ n) < µ < x + t(s ÷ n)
µ = x ÷ N
z = (x - x-bar) ÷ /n
t = (x - x-bar) ÷ s/n
WHY?
A)x - t(s ÷ n) < µ < x + t(s ÷ n)
B)µ = x ÷ N
C)z = (x - x-bar) ÷ /n
D)t = (x - x-bar) ÷ s/n
Explanation / Answer
Option (D) is the correct formula, there is no reason, its just fact.
(A) is for CI, B is for sample mean, (c) is used when population std dev is known.
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