Statistics: Computing Confidence Intervals – #18


Question: A sample of 10 international telephone calls provided the Sprint and WorldCom calling rates per minute for calls from the United States (World Traveler, July 2000)

Country Sprint WorldCom
Australia 0.46 0.26
Belgium 0.69 0.4
Brazil 0.92 0.53
Colombia 0.55 0.53
Denmark 0.5 0.26
France 0.46 0.26
Germany 0.46 0.26
Hong Kong 0.92 0.4
Japan 0.69 0.4
United Kingdom 0.46 0.26

Provide a 95% confidence interval estimate of the difference between the two population means.

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