Confidence interval for the population proportion

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What is the proportion of customers who buy service plans when they buy a computer? To find out, you surveyed 142 customers and found that 53 purchased the service plan. What is the upper boundary of 90% confidence interval for the population proportion? Use Excel and round your answer to two decimal places. Give the answer as a decimal percent (that is, for 10%, give 0.1).

Reference no: EM132483327

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