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[PDF File]How to Manage a Statistically Significant Increase (SSI ...
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How to Manage a Statistical ly Significant Increase (SSI) During Groundwater Detection Monitoring under the CCR Rule . Bob Glazier, P.G. 1 and Bruce Sass, Ph.D. 2 1 Geosyntec Consultants, Inc., 10211 Wincopin Circle, 4 th Floor, Columbia, MD 21044 . 2 Geosyntec Consultants, Inc., 150 E. Wilson Bridge Road, Suite 232, Worthington, OH 43085
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[PDF File]Designing a Statistically Sound Sampling Plan
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Sampling Plans zSimple Random Sample zEach sampling unit has an equal probability of being sampled with each selection. zCan perform simple random sampling if: zEnumerate every unit of the population zRandomly select n of the numbers and the sample consists of the units with those IDs zOne way to do this is to use a random number table or random number generator
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[PDF File]How Many Are Enough? Statistical Power Analysis and Sample ...
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subjects increases power, but also the duration and cost of the study. Samples can actually be too large, in which case treatment effects are statistically significant but of such small magnitude as to hold no clinical significance. So it is worth the time and effort to assure the
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A Statistical Significance Simulation Study for the ...
achieved a statistically significant difference as the term is typically defined (p
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[PDF File]Differentiating statistical significance and clinical ...
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detect a statistically significant change in heart rate (p = 0.248). They reported that seven other studies with larger samples found a statistically significant difference in heart rate with a music interven-tion. Because of this and the other findings they identified, they be-lieve their study was underpow-ered, meaning its sample size was
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[PDF File]04752 CH09 0075 - Jones & Bartlett Learning
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with the bias statistically, as for example by age-adjustment of rates. To rule out reason 3, we test for statistical significance. If the test shows that the observed difference is too large to be explained by random variation (chance) alone, we state that the difference is statistically significant and thus conclude that drug A is superior to ...
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[PDF File]When is statistical significance not significant? - SciELO
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cally trichotomized approximately into highly significant, marginally significant, and not statistically significant at conventional levels, with cutoffs at p≤0.01, p≤0.05 and p>0.10 (Gelman, 2012: 2). According to Cramer and Howitt (2004), The level at which the null hypothesis is rejected is usually set as 5 …
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[PDF File]Sampling Strategies for Error Rate Estimation and Quality ...
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Bootstrapping to create larger data sets by taking random samples from initially small samples. The key assumption in this process is that the sample data is representative of the entire data set. With the newly created data set, we were able to estimate an interval for mean shortfall amount given a desired confidence level.
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[PDF File]2 Sample t-Test (unequal sample sizes and unequal variances)
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two samples representing different decorative styles from an archaeological site. However, this time we see that the sample sizes are different, but we are still interested in seeing whether the average thickness is statistically significant between the two samples or not.
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Statistical versus Practical Significance - The Atrium
When reading statistically significant study results, keep the following warning signs in mind: -Observe the sample size used to obtain study results. Remember that if the study is based on a very large sample size, relationships found to be statistically significant may not have much practical significance.
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Statistically significant number of samples