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Question 2 Part (a) Using the “Bus Maintenance.xls” file, carry out a t-test in Excel (with α = 0.05) that...

(a) When you perform the t-test in excel you should get the following:


t=-0.2006236844
p=.8416030944
df=66.72581946
`bar(x_1)=448.7179487 `
`bar(x_2)=451.7 `
SX1=71.8375172
SX2=51.5592394
n1=39
n2=30


(b) Do not reject the null hypothesis as p>.05


(c) If the means of the two samples are really equal, p gives the probability that random samples from the two populations could look like the samples we obtained. Here the probability is quite high. If the probability was low enough (here less that 0.05) we would reject the null hypothesis and say that the populations probably have differing means.

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