Statistically valid sample size

    • [PDF File]Statistics: An introduction to sample size calculations

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      your sample size you increase the precision of your estimates, which means that, for any given estimate / size of effect, the greater the sample size the more “statistically significant” the result will be. In other words, if an investigation is too small then it will not detect results that are in fact important. Conversely, if a very ...

    • [PDF File]How To Establish Sample Sizes For Process Validation Using The …

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      sample size. This installment will demonstrate two methods using the success-run theorem, which uses the confidence level (how sure we are) and reliability value (valid, consistent results) to determine appropriate statistically valid sample sizes for process validation. The first method does not allow or account for failures and is easier to calculate. The second method allows for a predetermined number …

    • [PDF File]Medicare and Medicaid Audit Sampling Strategies

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      14-08-2012 · If a particular probability sample design is properly executed, i.e., defining the universe, the frame, the sampling units, using proper randomization, accurately measuring the variables of interest, and using the correct formulas for estimation, then assertions that the sample and its resulting estimates are “not statistically valid” cannot

    • [PDF File]CMS Manual System

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      These instructions are provided to ensure that a statistically valid sample is drawn and that statistically valid methods are used to project an overpayment where the results of the review indicate that overpayments have been made. These guidelines are for reviews performed by the PSC or Medicare contractor BI or MR unit. Reviews that

    • SAMPLE SIZE: HOW MANY IS ENOUGH? - Griffith University

      study does not include sufficient sample size to answer the question being studied in a valid manner, then enrolling participants may be unethical. Although sample size is a consideration in qualitative research, the principles that guide the determination of sufficient sample size are different to those that are considered in quantitative ...

    • [PDF File]A Practical Guide to Sampling - National Audit Office

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      Figure 1 (opposite) contains a sample size lookup table for samples selected using simple random sampling, the most frequently used method in the Office. If sampling for attributes then read off the sample size for the population proportion and precision required to give your sample size. If there is more than the one outcome,

    • [PDF File]Determining a Statistically Valid Sample Size: What Does FDA …

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      sample and still accept the “lot or batch” 0 Reject Number – Minimum number of defectives allowable in our sample that will cause “lot or batch” to be rejected 0 Sample Size – The number of units to be tested from the lot or batch. 0 Sampling Plan – A combination of sample size, accept/reject number with AQL and LQ levels. 10

    • [PDF File]Designing a Statistically Sound Sampling Plan

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      Sampling Plans zReasons for using different sampling plans: zSimple random sampling (SRS) ensures that all samples of size n are equally likely to be selected –units are selected independently – can use standard statistics zStratified random sampling ensures that each of the strata are represented in the sample and we can construct the sample to either

    • [PDF File]SAMPLING FOR INTERNAL AUDITORS - ISACA

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      Results not statistically valid ... 7 Sample Size n 204 Accounts 8 Expected Number of Errors (From Statistical Tables) 5 Assuming Control Procedures Anticipated Deviation Rate = Zero 0% Upper Precision Limit (UPL) from the Statistical Tables 1.50% (And is Less than Tolerable Deviation Rate=5%) 9 Assuming 2 Actual Control Procedure Errors: 2 Upper Precision Limit (from the Tables) UPL 3.20% 10 And UPL < ! …

    • [PDF File]Marketing Experiments Online Testing Certification Series

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      "Minimum sample size estimation" tool (Rows 7-30). - Once you believe you may have sufficient data to conclude the test and make a decision, you can use the "Sample Size Sufficiency" tool (Rows 39-50) to validate your assumption. Pre-test Planning: As you develop your test design and complete the Test Protocol, you will estimate the

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