This video steps through how to construct a 99% confidence interval when sigma is unknown. We use Excel's T.INV.2T function. A sample of hexagon head screw lengths is analyzed. Want to download the Excel file or know more on this topic? Go to my free openEd book: pressbooks.bcc...
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How to build a confidence interval using T.INV.2T (for the true mean where sigma is unknown)
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