Confidence Intervals

By employing a valid and reliable sampling methodology, random samples drawn from an unknown population distribution can be used to determine approximate values for the population mean and standard deviation. In this application, the proposed population mean is known as the point estimate and the researcher will typically calculate a confidence interval around this point estimate based upon a predetermined level of confidence. 

The following video provides some instruction related to calculating confidence intervals:

Excel is a powerful tool for statistical analysis.  In the video, learn how to use the provided Excel spreadsheet to calculate the confidence interval for your sample data. 

Here’s the Excel spreadsheet used in the previous video: Confidence Interval Sheet.xlsx

If you would like to build your own Excel spreadsheet to calculate the confidence interval for some sample data, check out the following video:

There are many freely available online confidence interval calculators.  The following video demonstrates a few of them: