The eccentricity e of an ellipse is defined as the number -, where a and c are the numbers given in equation (2). Because a > c, it a follows that e < 1. Write a brief paragraph about the general shape of each of the following ellipses. Be sure to justify your conclusions. (a) Eccentricity close to (b) Eccentricity = 0.5 (c) Eccentricity close to 1

Statistics is the science of collecting, classifying, presenting and interpreting data. Where Does Data Come From • Individuals o The objects described by a set of data. The objects can be people, animals or things. • Variable o Any characteristic of an individual. Variables can take different values for different individuals. Data Sources • Observational Study o Observes individuals and measures variables of interest but does not attempt to influence the responses. o The purpose of an observational study is to describe some group/situation. • Sample Survey o A sample survey is a type of observational study in which a sample is selected