Statistics Reviewer

Statistics/Presentation Statistics/Presentation of Data Frequency Distribution Measures of Central Tendency/Other Measures of Position

Statistics  branch of science which deals with the collection, presentation, analysis, and interpretation of data statistics  set of numerical data (e.g. vital statistics, monthly sales, exchange rate) Population  collection of all the elements under consideration in a statistical study Sample  part or subset of the population from which the information is collected Collection and Presentation of Data

Variable  characteristic or attribute of persons or objects which can assume different values or labels for different persons or objects under consideration 1. Discrete vs Continuous Discrete  a variable which can assume finite or at most countably infinite number of values; usually measured by counting or enumeration Continuous  a variable which can assume infinitely i nfinitely many values corresponding to a line interval 2. Q ualitative ualitative vs Q uantitative uantitative ualitative  a variable that yi elds categorical responses (e.g. occupation, marital status) Q ualitative uantitative  a variable that takes on numerical n umerical values representing an amount or quantity Q uantitative (e.g. height, weight, no. of cars) Frequency Distribution Table

Raw data  set of data in its original form Array  arrangement of observations according to their magnitude, either in increasing or decreasing order Class frequency  number of observations falling into the cl ass Class interval  the numbers defining the class Class limits  the end numbers of the class Class boundaries  the true class l imits; the lower class boundary (LCB) is usually defined as halfway between the lower class limit of the class and the upper class limit of the preceding class while the upper class boundary (UCB) is usually defined as halfway between the upper class limit of the class and the lower class limit of the next class Class size  the difference between the upper class boundaries of the class and the preceding class (or the difference between the lower class boundaries of the current class and the next class); constant c onstant for a set of classes Class mark  midpoint of a class interval