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[DOC File]AP Stats Chapter 10: Estimating with Confidence
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This one-sample t interval for a population mean is similar in both reasoning and computational detail to the one-sample z interval for a population proportion. The One-Sample t Interval for a Population Mean. Choose an SRS of size n from a population having unknown mean μ. A level C confidence interval for μ …
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[DOC File]BENEDICTINE UNIVERSITY
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Sample--subset of the population; must be representative of the population. Random sampling is a popular way of obtaining a representative sample. Parameter--a characteristic of a population, usually unknown, often can be estimated. Population mean, population variance, population proportion, etc. Statistic--a characteristic of a sample
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[DOC File]Key Fact 7 - Montgomery College
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Section 8.2 -Estimating a Population Mean: σ Not Known. 2) A simple random sample of size n is drawn from a population. If that sample has a mean of 59.2 and a standard deviation of 3.8, a) Compute the 90% confidence interval about µ if the sample size, n, is 45. (Use the closest degrees of freedom that is …
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[DOC File]Power and Sample Size Calculation
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For example, if a researcher knows that the statistics in the study follow a Z or standard normal distribution, there are two parameters that he/she needs to estimate, the population mean (μ) and the population variance (σ2). Most of the time, the researcher know one of the parameters and need to estimate the other.
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[DOC File]BENEDICTINE UNIVERSITY
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The sample mean is an unbiased estimator of the population mean. Unbiased estimator--just as likely to be greater than as less than the parameter being estimated. If every possible sample of size n is selected from a population, exactly as many sample. means will be above as will be below the population mean. Estimated Population Variance--"σ ...
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Estimated population mean calculator