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2.1 Introduction

Surveys collect data from populations using questionnaires. A survey can be designed to yield descriptive and predictive results. Government surveys often find descriptive facts about populations. A household expenditure survey is designed to find out how much money households spend on food and other expenditure categories. Other surveys ask manufacturers about their current hiring or firing of employees.

Predictive questionnaires gather information to explain some broad issues and to test hypotheses about them. For example, a bank might be interested in explaining the mortgage lending differences between regional markets. The resulting information is used to design new product offerings that match the needs of those markets. Predictive surveys answer questions such as "How can we design mortgages to meet the needs of different markets?"


  

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