Question

In a 15-day survey of air pollution in two European capitals, the mean particulate count (micrograms per cubic meter) in Athens was 39.5 with a standard deviation of 3.75, while in London the mean was 31.5 with a standard deviation of 2.25.
(a) Assuming equal population variances, does this evidence convince you that the mean particulate count is higher in Athens, at α = .05?
(b) Are the variances equal or not, at α = .05?


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  • CreatedAugust 19, 2015
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