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Test whether the increase was statiscally significant

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Reference no: EM131008368

1) Given 2 samples:

n1 = 39      x1- = 10       s1 = 1.4

 n2 = 36     x2- = 9         s2 = 1.25

a) Test if μ1 = μ2 with a one-tail at α = .05.

b) Do a 90% confidence interval.

2) Given 2 samples:

n1 = 28      x1- = 50.1       s1 = 3.9

n2 = 25     x2- = 53.5       s2 = 3.0

a) Test if μ1 = μ2 with a one-tail at α = .05.

b) Do a 90% confidence interval.

3) A device was installed to improve the gas mileage of vehicles in a small taxi fleet. Test whether the increase was statiscally significant with a two-tail test at α = .05.

Vehicle Before After
Car 47 15 16
Car 37 14 15
Car 22 13 15
Car 02 13 16
Car 10 12 13
Car 666 14 15

Reference no: EM131008368

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