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chapter8

# chapter8 - 8 1 ChapterEight Sampling Methods and the...

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8- 1 Chapter Eight Sampling Methods and the Central Limit Sampling Methods and the Central Limit Theorem Theorem GOALS When you have completed this chapter, you will be able to: ONE Explain why a sample is the only feasible way to learn about a population. TWO Describe methods to select a sample. THREE Define and construct a sampling distribution of the sample mean. FOUR Explain the central limit theorem. Goals

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8- 2 Chapter Eight   continued Sampling Methods and the Central Limit Sampling Methods and the Central Limit Theorem Theorem GOALS When you have completed this chapter, you will be able to: FIVE Use the Central Limit Theorem to find probabilities of selecting possible sample means from a specified population. Goals
8- 3 Why Sample the Population? Why sample? The destructive nature of certain tests. The physical impossibility of checking all items in the population. The cost of studying all the items in a population. The adequacy of sample results in most cases. The time-consuming aspect of contacting the whole population.

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8- 4 Probability Sampling/Methods Systematic Random Sampling The items or individuals of the population are arranged in some order. A random starting point
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