1.3 & 1.4 - 9/24/2008 HAWKES LEARNING SYSTEMS math...

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9/24/2008 1 Section 1.3 The Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2008 by Hawkes Learning Systems/Quant Systems, Inc. Al rights reserved. Collect Data Defines Population/ Variables Question Calculate Statistic Estimate Parameter Introduction to Statistics 1.3 Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists Observational Study – researcher observes data that already exists. Experiment – researcher seeks to create data to identify cause and effect relationships. Types of Studies: Introduction to Statistics 1.3 Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists A medical researcher wants to examine the effects of exercise on cardiovascular health. Experimental A recording company is interested in knowing the percentage of teenagers that download music off of the internet. Observational A chain of grocery stores wants to know how much the average family spends on produce each month. Observational Observational Study or Experimental Study? Introduction to Statistics 1.3 Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists Ask, “How will the data be gathered?” Very Important: It is essential that a representative sample is chosen out of the population. A good sampling frame is the first step to choosing a representative sample. The sampling frame is a list of members of the population. Observational Studies: Introduction to Statistics 1.3 Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists
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9/24/2008 2 Census Random Sample Stratified Sample Cluster Sample Systematic Sample Convenience Sample Sampling Techniques: Introduction to Statistics 1.3 Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists Census: Every member of the population is included. Introduction to Statistics 1.3 Process of a Statistical Study HAWKES LEARNING SYSTEMS math courseware specialists Random Sample: Every member has an equal chance of being selected. Introduction to Statistics
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This note was uploaded on 10/24/2010 for the course MATH Math 067 taught by Professor David during the Spring '10 term at Pierce College.

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1.3 & 1.4 - 9/24/2008 HAWKES LEARNING SYSTEMS math...

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