busa3321_chap01

busa3321_chap01 - Types of Data and Sampling 1. Terms 1.1 A...

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Types of Data and Sampling 1. Terms 1.1 A population (universe) is the collection of things under consideration 1.2 A sample is a portion of the population selected for analysis 1.3 A parameter is a summary measure computed to describe a characteristic of the population 1.4 A statistic is a summary measure computed to describe a characteristic of the sample 2. Types of Data 2.1 Qualitative 2.2 Quantitative (discrete or continuous) Or 2.1 Nominal 2.2 Ordinal 2.3 Interval 2.4 Ratio 3. Data Collection (This is not a list of every possible type just some of the most common) 3.1 Convenience Samples Data you have available; May or may not be random 3.2 Judgment Samples Data chosen based on a person’s decision about the correctness of collecting the observation; Usually not random 3.3 Random Samples (specifically a simple random sample) Every individual or item from the frame (a list) has an equal chance of being selected Measurements are typically direct measurements. 3.4 Surveys
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This document was uploaded on 12/12/2011.

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busa3321_chap01 - Types of Data and Sampling 1. Terms 1.1 A...

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