Facts101 is your complete guide to Elementary Statistics in Social Research, The Essentials. In this book, you will learn topics such as Measures of Central Tendency/Measures of Variability, Probability and the Normal Curve, Samples and Populations, and Testing Differences between Means plus much more. With key features such as key terms, people and places, Facts101 gives you all the information you need to prepare for your next exam. Our practice tests are specific to the textbook and we have designed tools to make the most of your limited study time.