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Finding the Margin of Error and Confidence Level

I need to find out how to calculate the margin of error when given the data: c=95; s=0.10; n=20; x(bar) = 1.5 and how to construct a confidence interval of the population mean. This example is similar to my studies.

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For a 95% confidence level, note that the degree of freedom is n-1=19, we have

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