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Basic Math & Pre-Algebra

1,001 Basic Math & Pre-Algebra Practice Problems For Dummies

To successfully master basic math, you need to practice addition, subtraction, multiplication, and division problems. You also need to understand order of operations, fractions, decimals, percents, ratios, weights and measures, and even a little geometry. [more…]

Basic Math & Pre-Algebra

How to Find the Least Common Multiple

The least common multiple (LCM) of a set of numbers is the lowest positive number that is a multiple of every number in that set. This article shows you how to find the LCM. [more…]

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Measures of Association

Measures of association quantify the strength and the direction of the relationship between two data sets. Here are the two most commonly used measures of association: [more…]


Measures of Central Tendency

Measures of central tendency show the center of a data set. Three of the most commonly used measures of central tendency are the mean, median, and mode. [more…]


Measures of Central Dispersion

Measures of central dispersion show how "spread out" the elements of a data set are from the mean. Three of the most commonly used measures of central dispersion include the following: [more…]

Statistics for Big Data For Dummies Extras

Statistics for Big Data For Dummies Cheat Sheet

Summary statistical measures represent the key properties of a sample or population as a single numerical value. This has the advantage of providing important information in a very compact form. It also [more…]

Statistics for Big Data For Dummies Extras

10 Key Concepts in Hypothesis Testing

Hypothesis testing is a statistical technique that is used in a variety of situations. Though the technical details differ from situation to situation, all hypothesis tests use the same core set of terms [more…]