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Suppose researchers are about to draw a sample of 1380 observations from a normally distributed population, and use this data to create a confidence interval

Suppose researchers are about to draw a sample of 1380 observations from a normally distributed population, and use this data to create a confidence interval for the population mean using the t procedure. They don't know much about statistics, and decide to use a value of 0.38 to calculate the margin of error. (Since, curiously, that is their favourite number.) What is the confidence level of this confidence interval?

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