Sample size for population proportion
[DOC File]Class notes
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Estimating a Population Proportion: Requirements. The sample is a simple random sample. The conditions for the binomial distribution are satisfied. (See Section 5-3.) There are at least 5 successes and 5 failures. Notation: population proportion. sample proportion of x successes in a sample of size n. sample proportion of failures in a sample ...
[DOC File]Attribute Sampling Plans Article:
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Population Size-total number of items in the population-only important if the sample size is greater than 5% of the population in which case the sample size reduces. Population Proportion-the portion of items in the population displaying the attributes that you are seeking
[DOC File]Sampling and Sample Size - Columbia University
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If the expected proportion is more than half, then plan the sample size based on the proportion expected NOT to have the characteristic. That is, switch the roles of P and 1-P. If P or 1-P is very close to 0 or 1 (i.e. the characteristic of interest is rare or happens most of the time), the sample size formula of N = 1 / E2 is not appropriate.
[DOC File]STAT 200 FINAL PRACTICE TEST
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1 sample mean t, df = n-1 sample mean population mean in Ho From A) 945 945. Q1) HT for proportion use: 1 sample proportion z sample proportion, p’=number of successes / n population proportion, p, in Ho HT: CI: Picture of how all p’ s would be distributed if . …
[DOC File]Quick method for estimating the margin of error
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The confidence statement uses the sample result to say something about the population of all adults. Our conclusion about the population is never completely certain. Gallup's sample might be one of the 5% that miss by more than 2.4 percentage points. A sample survey …
[DOC File]CHAPTER 8—INTERVAL ESTIMATION
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24. Using an = 0.04 a confidence interval for a population proportion is determined to be 0.65 to 0.75. If the level of significance is decreased, the interval for the population proportion. a. becomes narrower b. becomes wider c. does not change d. remains the same ANS: B PTS: 1 TOP: Interval Estimation 25.
[DOC File]HOMEWORK 5b--GENDER AND STATISTICS GRADES- …
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1. Use spreadsheet > to conduct estimation and hypothesis testing on the population proportion of college male and female statistics students receiving high ("A" or "B") grades. The data are from random samples from the relevant populations. Sample Size X* Males (X) 30 + _____ (number of letters in your first name) 13
[DOC File]Exam 3 Practice Questions
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Determining sample size for estimating proportions and means. Practice Problems on next page. 1. You take a random sample from some population and form a 96% confidence interval for the population mean, Which quantity is guaranteed to be in the interval you form? a) 0. b) c) d) .96. 2.
[DOC File]Chapter 10: Estimating Proportions With Confidence
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The sample is a randomly selected sample from the population. The normal curve approximation to the distribution of possible sample proportions assumes a ‘large’ same size. You should check to make sure that both n and n(1-) are both larger than 10.
[DOC File]HOMEWORK 5A--GENDER AND STATISTICS GRADES--MEANS
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Sample Size “X” value Males (X) 500 230 Females (Y) 400 210. a. The point estimate of the population proportion is: Males: 0.46 Females: 0.525. b. The sampling standard deviation (standard error) of the sample proportions is: Males: 0.0222890 Females: 0.0249687. c.
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