Learn how to calculate confidence intervals and create confidence interval plots with Minitab. From sample data, a confidence interval is a statistically calculated range of values within which contains a population parameter, with a certain level of confidence (most commonly at a 95 percent confidence level). That population parameter is usually the Mean, but confidence intervals can also be established for the Median and Standard Deviation. Interval plots of the mean are indicative of just how different the population parameters might be across the group. Minitab calculates and displays confidence intervals with ease.
- [Voiceover] In this movie, I will show you how to create confidence interval plots using Minitab. Open your exercise file 03-03. Here we have processing time data for four office locations: A, B, C, D. I want to compare the means of these processing times across these four offices. Since we have sample data, I would like to try and rate confidence interval plots for the population mean. To do that, go up to Graph, Interval Plot, and since our data are located in four columns, so we choose Multiple Y's and because we have no groupings or subgroupings, we'll stick with Simple.
Select OK. Highlight all four columns and OK. There we are, confidence interval plots for the mean at 95% confidence interval. We have the mean being the blue dots and the limits being the ends of these intervals. So to summarize, our command is Graph, Interval Plot. So that's confidence interval plots using Minitab. Thank you.
Dr. Richard Chua shows how to import and organize data; open, save, and share Minitab worksheets and projects; create graphs and charts; and use descriptive statistics and statistical tests in Minitab to make inferences and data-driven decisions. Then learn how to make inferences on continuous data—running normality tests, variance tests, correlations, and simple regression tests. Finally, discover how to share your findings with others using reports and simple copy-and-paste techniques. Start watching to learn why Minitab is one of the world's most popular statistical software tools.
- Determine how to utilize display graphs and charts including bar, Pareto charts, and scatterplots.
- Recognize how to compare variance and multiple means.
- Identify how to compare medians.
- Explore how to run a multiple regression test and examine the resulting data.
- Break down how to compare inferences on continuous data.
- Differentiate how to compare proportions.