This book includes topics aspire to learn who want to use statistics, which has become at the present time a necessity for the countries’ progress because of the close link between the statistics and planning, development and other sciences. One which tracks the science of statistics and its definitions confirmed his conclusion that the statistics is an instrument containing many methods that are used in the data collection, tabulation, presentation along with the study and analysis of the problems in the sectors of the state and the various fields of life {Financial, economic, demographic, industrial, petroleum, agricultural, environmental, social, educational, geographical, engineering, and others} and interpret and predicted for it.