What Should Be Done Before Any Changes Are Made to a System

question 2

Multiple Choice

 What should be done before any changes are made to a system that is experiencing a problem?

• A) Examine the system
• B) Backup data
• C) Establish a Theory
• D) Test your Theory

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Definitions:

T-test

A statistical test used to compare the mean of a sample to a known value, or the means of two samples, to assess if the differences are statistically significant.

Regression Analysis

The statistical process for estimating the relationships among variables, often used to predict a dependent variable from one or more independent variables.

Indicator Variables

Variables in statistics used to represent categorical data with values indicating the presence or absence of a characteristic.

Analysis of Variance (ANOVA)

A statistical method used to compare the means of three or more samples to understand if at least one of the sample means significantly differs from the others.