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Suppose that a consumer advocacy group would like to conduct a survey to find the proportion...

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Statistics

Suppose that a consumer advocacy group would like to conduct asurvey to find the proportion p of smartphone users thatwere happy with their smartphone. The advocacy group took a randomsample of 1,000 smartphone users and found that 400 were happy withtheir smartphone. A 90% confidence interval for p isclosest to:

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