Normality > Lilliefors Test What is Lilliefors Test? The Lilliefors test is a test for normality. It is an improvement on the Kolomogorov-Smirnov (K-S) test — correcting the K-S for small values at the tails of probability distributions — and…

# Standardized Values: Example

Hypothesis Testing > Standardized Values Standardized values (also called standard scores or normal deviates) are the same thing as z-scores. A standardized value is what you get when you take a data point and scale it by population data. It…

# 68 95 99.7 Rule in Statistics

Probability and Statistics > Basic Graphs and Charts > 68 95 99.7 rule What is the 68 95 99.7 rule? When you use a standard normal model in statistics: About 68% of values fall within one standard deviation of the…

# Normal Distribution Probability in Statisitcs

Statistics Definitions > What is normal distribution probability? Normal Distribution Probability A normal distribution is a symmetric distribution shaped like a bell: Bell curves can represent lots of natural phenomena. For example, grades in class will often be bell-shaped: most…

# How to Create a Normal Probability Plot in Minitab

Normal probability plots > Normal probability plot in Minitab A normal probability plot is one way you can tell if data fits a normal distribution (a bell curve). With this type of graph, z-scores are plotted against your data…

# Normal Probability Plot: Definition, Examples

Statistics Definitions > What is a Normal Probability Plot? What is a Normal Probability Plot? When you have a set of data that you think might have a normal distribution (i.e. a bell curve), a graph of your data can…

# Normal Distribution Probability in Excel

Microsoft Excel for statistics > Normal Distribution Probability in Excel Before you begin, you might find it helpful to review what a normal distribution is. See: What is a normal distribution? You can also review what different types of word…

# Chebyshev’s Theorem: How to Calculate it by Hand and in Excel

Hypothesis Testing > Chebyshev’s Theorem Before you start, you may want to read this article on Chebyschev’s Inequality, which explains when you would want to use the theorem. Chebyshev’s Interval refers to the intervals you want to find when using…

# Normal Distribution Excel 2007: Graphing in Easy Steps

Excel for statistics topic list > Standard Normal Distribution Excel 2007 Watch the video or read the steps below: A standard normal is a normal distribution that has a mean, μ, of zero and a standard deviation, σ, of one.…

# Normal Approximation to solve a Binomial Problem

Binomial Theorem > Normal Approximation to solve a binomial problem Normal Approximation: Overview When n * p and n * q are greater than 5, you can use the normal approximation to solve a binomial distribution problem. This article shows…