Here is a graphical summary of the sample data for mean height using Minitab. That interval is called the confidence interval, which is a statistically calculated range of values that contains a population parameter, such as the mean, with a certain level of confidence. But having a 100% confidence level with such a wide interval is not useful.
#MINITAB CONFIDENCE INTERVAL PDF#
When possible, compare the confidence bounds with a benchmark value that is based on process knowledge or industry standards. Confidence Intervals for Capability Indices Using Minitab - Bower - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
Now, how confident will you be in saying that an interval of zero to 100 inches includes the population mean? Now you're probably 100% confident. The confidence interval helps you to assess the practical significance of your sample estimate. How confident are you in saying that the population mean is exactly 69.87 inches? You probably have a zero percent confidence level. Make sure that the data you want to find the C.I. Confidence intervals are contained Stat -> Basic Statistics -> 1-Sample t. So, you take a sample of 20 employees and find that the sample mean is 69.87 inches. Finding a confidence interval using Minitab Enter your raw data in a column and give it a variable name. It's not practical to measure every one of them. Let's say you're interested in determining the mean height of the employees in your company, but there are 500 employees. View Lab Report - MAT120 - Week 5 Minitab Instructions.pdf from MAT 120 at Phoenix College.