Regression Analysis is a way of estimating the relationships between different variables by examining the behavior of the system. There are many techniques for modeling and analyzing the dependent and independent variables. For example, transformations can be used to reduce the hire-order terms in the model. Remember the equation for a line that you learned […]

## How to Calculate a Sample Size Given Standard Deviation, Confidence Interval and Margin of Error

The equation we want to use is: Sample Size = (Z*σ / Margin of Error)^2 We’ll use the following example question from the ASQ Black Belt Exam. Question: When σ = 10, what sample size is needed to specify a 95% confidence interval of ±3 units from the mean? (A) 7 (B) 11 (C) 32 (D) […]

## Design of Experiments: Blocking

Blocking involves recognizing uncontrolled factors in an experiment – for example, gender and age in a medical study – and ensuring as wide a spread as possible across these nuisance factors.

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