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uses sample data to estimate an unknown population paramater with an indication of how accurate the estimate is and of how confident we are that the result is correct , estimate±margin of error
confidence level C
gives the probability that the interval will capture the true parameter value in repeated samples. That is, the confidence level is the success rate for the method.
Conditions for constructing a confidence interval for µ
the data comes from SRS, the sampling distribution is normal, individual observations are independent
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