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you intend to estimate a population mean with a confidence interval . you believe the population to have a normal distribution . your sample size

you intend to estimate a population mean with a confidence interval . you believe the population to have a normal distribution . your sample size is 39.

while it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 86.9%.

(report answer accurate to three decimal places with appropriate rounding.

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