# Six Sigma and Statistics

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## What is Covariance in statistics: How to use it in excel and how it is different from correlation

What is Covariance in statistics Covariance is a mathematical or statistical tool which measures the relationship between two random variables. …

## Correlation and Regression: When to use these 2 in analysis

Correlation and Regression What is a correlation: Correlation is a test in statistics to get to know if there is …

## What are measures of dispersion: How to calculate range, variance, Quartile and standard deviation

An absolute measure of dispersion is one that measures dispersion in terms of the same units as the unit of data. if the unit of data is meter, kilogram or mile then measure of dispersion will be in the same unit.

## What are measures of central tendency: How to calculate it in Excel?

What are measures of central tendency? A measure of central tendency is a single value that attempts to describe a set of …

## What is Data: 2 types of data and their general understanding

What is Data Data are basically units of information that are usually numeric. Technically it is a set of values …