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
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
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
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?
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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