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[DOCX File]Notes 8.2: Confidence Intervals with Proportions
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Thm: If and are sample proportions from two independent random samples of size n1 and n2 from two populations with proportions p1 and p2, then a ( 1 - ( ) 100% confidence interval for (p1 - p2) is if n1 > 5, n1(1-) > 5, n2 > 5, and n2(1-) > 5.
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[DOC File]Stat 475/920 Notes 3
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Population and Sample proportions: In statistical sampling we often want to estimate the proportion, p, of “successes” in a population. “Success” is when the categorical variable takes on one particular value of interest. p = count of successes in population. size of population = X / N = a fixed but unknown value between 0 and 1.0
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[DOC File]Name of Unit: Capture/Recapture
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0% confidence$38,000 (a point estimate) The wider the interval, the greater the confidence you have that your answer contains the population parameter. However, the wider the interval, the less precision you will have. There is always a struggle between confidence and precision. The more confidence, the more spread…but less precise!
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[DOC File]HOMEWORK 5b--GENDER AND STATISTICS GRADES- …
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Describe/identify ratios and proportions. Describe the difference between a simulation and an experiment. Skills: Use proportions to estimate a population size. Organize data. Create a display of the sampling distribution. Calculate descriptive statistics—measures of center, measures of spread.
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[DOC File]CHAPTER 9—POINT AND INTERVAL ESTIMATION
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Power and Sample Size Calculation Using SAS Menu. Power and sample size can also be calculated using the menu in SAS. When using the menu, the user should specify the chosen design for the underlying project, and then fill in the required parameters needed to do the calculation for each design. The general procedure of using the menu is as ...
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[DOC File]Chapter 10: Estimating Proportions With Confidence
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Show the proportion and its complete solution for estimating the total population size. Statement of the conclusion—Restate the hypothesis and use the data as evidence that supports the conclusion. Procedures for Lab Activity. Biologists often use the mark-and-recapture technique to estimate the size of a population.
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[DOC File]SECTION 8
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2. Using the same data, conduct estimation and hypothesis testing on the difference between the population proportions of college male and female statistics students receiving high grades. a. The point estimate of the difference between population proportions is: b.
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[DOC File]Teacher(s): - Hofstra University
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To use the above equations to estimate the needed sample size, we need an estimate of the population standard deviation . For proportions, , which is approximately for large populations. The maximum value of is 0.5. For proportions, we can conservatively choose to be 0.5.
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Sample Size Calculator to Estimate a Population Proportion
Population Size does not effect M.O.E. or the accuracy of the survey. Using Confidence Intervals to Guide Decisions A value not in a confidence interval can be rejected as a possible value of the population proportion.
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Estimate population size using proportions