Chapter7_Sampling_and_SamplingDistributions

Chapter7_Sampling_an - Chapter 7 Sampling Sampling Distributions Sampling Distributions Basics Inferential Statistics The area of statistics in

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Chapter 7 Sampling & Sampling Distributions
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Sampling Distributions Basics Inferential Statistics The area of statistics in which conclusions or statements are made about a population of interest Inferences are based on the sample data obtained from the population
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Sampling Distributions Basics Parameter Numerical descriptive measurement of a population Asumed to be known In actuality, parameters are never (or rarely ever) known Take a sample to make inferences about the population
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Sampling Distributions Basics The sample results provide estimates of the values of the population characteristics With proper sampling methods, the sample results can provide “good” estimates of the population characteristics
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Simple Random Sample A simple random sample of size n from a finite population of size N is…
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Simple Random Sampling (cont) Sampling with replacement Sampling without replacement is used more often. Why? In large sampling projects, computer generated random numbers are used to automate the sampling process
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Sampling Distributions Basics Sample Statistics Numerical descriptive measures obtained from the sample Examples: We will examine the properties of these statistics b/c these statistics have distributions themselves
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Sampling Distribution of the Mean Normal Distribution Function of two parameters: Want to estimate μ Use mean, median, mode, etc. Which one would be closer to the “true” value?
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Example Suppose we KNOW the TRUE average height of students in the class is 68 inches. If we number each student from 1-35 and
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This note was uploaded on 04/02/2008 for the course BIT 2405 taught by Professor Plkitchin during the Spring '08 term at Virginia Tech.

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Chapter7_Sampling_an - Chapter 7 Sampling Sampling Distributions Sampling Distributions Basics Inferential Statistics The area of statistics in

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