Question
Aresearcher recorded the ages of randomly selected passenger cars and randomly selected taxis in Dublin, Ireland. The ages (in years) are listed below. Cars: 4,
Aresearcher recorded the ages of randomly selected passenger cars and randomly selected taxis in Dublin, Ireland. The ages (in years) are listed below.
Cars: 4, 0, 8, 11, 14, 3, 4, 4, 3, 5, 8, 3, 3, 7, 4, 6, 6, 1, 8, 2, 15, 11, 4, 1, 6, 1, 8
Taxis: 8, 8, 0, 3, 8, 4, 3, 3, 6, 11, 7, 7, 6, 9, 5, 10, 8, 4, 3, 4
When using a 0.05 significance level to test the claim that there is a difference between the mean age of a Dublin car and the mean age of a Dublin taxi, we obtain the following results.
H0: 1= 2 H1: 1 2 CV: 2.093 t = -0.307
Fail to reject H0. There is not sufficient evidence to support the claim that 1 2.
Now include an outlier consisting of a car that is 50 years old. Is the hypothesis test dramatically affected by the presence of the outlier?
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