Calculate the appropriate one-sided confidence interval

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Marketing companies widely use surveys in order to monitor the opinions of the consumers. Last year, a survey was undertaken to ask consumers who buy different warranties for electronic appliances. Of a sample of 1,100, 56% indicated that they would buy the warranty. This year, another survey of 800 consumers revealed that 46% will buy the warranty.

How to calculate the appropriate one-sided 95% confidence interval for the decrease in the percentage of people who buy warranties for electronic appliances between last year andthis year?

If we are talking about one sieded, do we have to always use alpha rather than alpha/2?

Reference no: EM132853045

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