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[DOC File]Exam 3 Practice Questions
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The large-sample confidence interval formula for proportions is valid if np ≥ 15 and n(1-p) ≥ 15. Large-sample confidence intervals always contain the true parameter value, whereas small-sample confidence intervals may not. We form small-sample confidence intervals by using the large-sample formula after adding 4 …
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[DOC File]Sampling and Sample Size - Columbia University
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(sample size is based on margin of error, E, in confidence intervals) N = 1 / E2, for P near 0.5. or. N = (2 / E)2 P(1-P), for P near 0 or 1. N = (2S / E)2. where S is the standard deviation of the variable A confidence interval is a range of likely or plausible values of the population characteristic of interest.
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[DOC File]Stats 156 – Calculator Stuff
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Confidence Interval for (In STAT – inside TESTS. 1. 1-PropZInt. ... n = sample size. One Sample t Test (or z Test) for a Population Mean. In STAT – inside TESTS. 1. ... Put the table into a matrix in the calculator • Go to MATRIX in the calculator • Choose “EDIT” and 1:[A]
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[DOC File]STAT 103 Sample Questions for the Final Exam
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the 99% confidence interval is wider; ____the 95% confidence interval is wider; ____you can't say unless you know the sample size and standard deviation. The multiplier for 95% is 1.96 and the multiplier for 99% is 2.576, making the 99% confidence interval wider. See Chapters 21 and 23. 4.
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[DOC File]AP Stats Chapter 10: Estimating with Confidence
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A random sample of students gave a sample average of $3975, and a 95% confidence interval was found to be $3525 < µ < $4425. Which of the following is a correct interpretation of 95% confidence? A.
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[DOC File]Key Fact 7 - Montgomery College
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a) Compute the 90% confidence interval about µ if the sample size, n, is 45. 59.2 ± .9318 → (58.27, 60.13) For calculator feature use STAT, arrow to TESTS, and select 7:ZInterval, select Stats enter the required information, and CALCULATE. b) Compute the 90% confidence interval about µ if the sample size, n, is 55.
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[DOC File]Power and Sample Size Calculation - Purdue University
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Factors that affect statistical power include the sample size, the specification of the parameter(s) in the null and alternative hypothesis, i.e. how far they are from each other, the precision or uncertainty the researcher allows for the study (generally the confidence or significance level) and the distribution of the parameter to be ...
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[DOC File]Statistics Calculator - My Math Genius
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Three worksheets are provided: Confidence Interval, Hypothesis Testing, and Sample size determination. EXAMPLE1: Compute a 95% confidence interval for a sample of 50 items, where the mean was computed to be 20, and the population standard deviation is known to by 10.
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[DOC File]Sampling Distribution and Confidence Interval Problems
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e) Construct and turn in a copy of a plot of the power vs. the sample size when the population mean which makes the alternative true is equal to 244 mg/dl. Use it to estimate the …
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Confidence interval sample size calculator