Unit 11-1

Unit 11-1 - Sampling Distributions of Proportions...

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Sampling Sampling Distributions of Distributions of Proportions Proportions
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Toss a penny 20 times and record the number of heads. Calculate the proportion of heads & mark it on the dot plot on the board. What shape do you think the dot plot will have? The dotplot is a partial graph of the sampling distribution of all sample proportions of sample size 20. If I found all the possible sample proportions – this would be approximately normal!
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Sampling Distribution Sampling Distribution Is the distribution of possible values of a statistic from all possible samples of the same size from the same population In the case of the pennies, it’s the distribution of all possible sample proportions (p) We will use: p for the population proportion and p-hat for the sample proportion
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Suppose we have a population of six Suppose we have a population of six people: Alice, Ben, Charles, Denise, people: Alice, Ben, Charles, Denise, What is the proportion of females? What is the parameter of interest in this population? Draw samples of two from this population.
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This note was uploaded on 12/09/2011 for the course STATS 221 taught by Professor Nielson during the Fall '10 term at BYU.

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Unit 11-1 - Sampling Distributions of Proportions...

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