Statistics - Appendix A

Statistics - Appendix A - S tatistics Appendix Revision 3 1...

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Statistics – Appendix Revision 3 1. Introduction – Terms A. Population – Contains all instances to which you intend to generalize - All the things you are going to talk about, usually very large B. Sample – A subset of a population - Any part of a population - Population sample versus representative sample - Representative sample must be selected carefully to make accurate predictions, represents the population. Know what are: - Cross-section of a population: 20% Hispanics (pop.) 20% (rep. sample) 50% Females (pop.) 50% (rep. sample) - Each member of the population must have equal chance of being selected - Every selection must be independent of the other selection – every 10 th person is a biased sample. C. Parameter – A quantitative characteristic of a promotion - Samples the population to generalize D. Statistic – A quantitative characteristic of a sample
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- Statistics is the parameter, what you collect 2. Descriptive Statistics A. Purpose – To summarize and to describe B. Types 1. Graphs and tables 2. Measure of central tendency A. Mean-arithmetic average Example: 9 workers packed 309 cases of bread. What is the average
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Statistics - Appendix A - S tatistics Appendix Revision 3 1...

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