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How to Create a Graphical Version of the 1-sample t-Test in Minitab
This is a companion post for a series of blog posts about understanding hypothesis tests. In this series, I create a graphical equivalent to a 1-sample t-test and confidence interval to help you...
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Making Better Estimates of Project Duration Using Monte Carlo Analysis
by Lion "Ari" Ondiappan Arivazhagan, guest blogger. Predicting project completion times is one of the major challenges project managers face. Project schedule overruns are quite common due to the high...
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How Could You Benefit from a Box-Cox Transformation?
Imagine that you are watching a race and that you are located close to the finish line. When the first and fastest runners complete the race, the differences in times between them will probably be...
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Identifying the Distribution of Your Data
To choose the right statistical analysis, you need to know the distribution of your data. Suppose you want to assess the capability of your process. If you conduct an analysis that assumes the data...
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3 New Things You Can Do by Right-Clicking in Minitab 17.2
Minitab 17.2 is available. You can check out all of the new stuff on the What’s New Page, but I would say that a little demonstration is in order. Here are some new shortcuts that make arranging your...
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Understanding Hypothesis Tests: Confidence Intervals and Confidence Levels
In this series of posts, I show how hypothesis tests and confidence intervals work by focusing on concepts and graphs rather than equations and numbers. Previously, I used graphs to show what...
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Wave a Magic Wand Over Your DOE Analyses
As a member of Minitab's Technical Support team, I get the opportunity to work with many people using DOE (Design of Experiments).People often will call after they've already chosen their design, run...
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Getting the Most Out of Your Text Data, Part 1
With Minitab, it’s easy to create graphs and manage numeric, date/time and text data. Now Minitab 17.2’s enhanced data manipulation features make it even easier to work with text data.This is the...
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Getting the Most Out of Your Text Data, Part 2
My previous post focused on manipulating text data using Minitab’s calculator.In this post we continue to explore some of the useful tools for working with text data, and here we’ll focus on Minitab...
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Getting the Most Out of Your Text Data Part III
The two previous posts in this series focused on manipulating data using Minitab’s calculator and the Data menu.In this third and final post, we continue to explore helpful features for working with...
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How Could You Benefit from the Cpm Capability Index?
The Cp and Cpk are well known capability indices commonly used to ensure that a process spread is as small as possible compared to the tolerance interval (Cp), or that it stays well within...
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No Horsing Around with the Poisson Distribution, Troops
In 1898, Russian economist Ladislaus Bortkiewicz published his first statistics book entitled Das Gesetz der keinem Zahlen, in which he included an example that eventually became famous for...
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Thinking about Predictors in Regression, an Example
A few times a year, the Bureau of Labor Statistics (BLS) publishes a Spotlight on Statistics Article. The first such article of 2015 recently arrived, providing analysis of trends in long-term...
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Data Driven Analysis of the Republican Field of Presidential Candidates for 2016
The 2016 presidential race is becoming more real. We’ve had several announcements with Ted Cruz, Rand Paul, Hillary Clinton, and Marco Rubio officially entering the race to be President. While the...
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The Easiest Way to Do Capability Analysis
A while back, I offered an overview of process capability analysis that emphasized the importance of matching your analysis to the distribution of your data.If you're already familiar with different...
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Item Analysis with Cronbach's Alpha for Reliable Surveys
Many of the things you need to monitor can be measured in a concrete, objective way, such as an item's weight or length. But, many important characteristics are more subjective, such as the...
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Continuous Process Improvement and the Homework Dilemma…
Generally speaking, I have a problem with authority. I don’t like being told what to do or how to do it. I’m not proud of that.I recall debating with my High School Trigonometry teacher regarding the...
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LeBron vs. Jordan? Hey, What About Tim Duncan?
The NBA playoffs are under way, and all eyes are on LeBron James to see if he can finally bring a championship to Cleveland. But one could argue that there is even a bigger storyline going on: whether...
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What Should I Do If My Data Is Not Normal?
As a Minitab trainer, one of the most common questions I get from training participants is "what should I do when my data isn’t normal?" A large number of statistical tests are based on the assumption...
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Cp and Cpk: Two Process Perspectives, One Process Reality
It’s usually not a good idea to rely solely on a single statistic to draw conclusions about your process. Do that, and you could fall into the clutches of the “duck-rabbit” illusion shown here:If you...
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