ECI - Creating and Using Confidence Intervals Lesson

ECI - Creating and Using Confidence Intervals Lesson

In this course the focus is primarily on forming conclusions about means or proportions. Remember, means are a numerical statistic associated with quantitative data while proportions are percent values associated with categorical data. The idea of creating a confidence interval around other statistical measures like spread or standard deviation does exist but goes beyond the scope of this course. Before the end of the course we will address confidence intervals around our estimate of SLOPE from the earlier topic of linear regression.

The study of confidence intervals begins by creating a confidence interval for an estimate resulting from a one-sample proportion.   Of course, the question arises about how to handle two-sample proportions where the natural tendency is to want to compare the two things. Slightly different calculations are necessary for finding a confidence interval around a mean.   The procedure for means varies based on what we know about the population and the size of the sample.

More detail and examples are contained in the lesson below. Click on the lesson to open. This lesson is comprehensive and introduces ALL types of confidence intervals and their calculations.   Each will be studied in much more detail throughout the unit.

Creating and Using Confidence Intervals Links to an external site.

 

IMAGES CREATED BY GAVS