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[DOC File]California State University, Sacramento
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(The values in the table below were calculated on my calculator) Populations Sample Size Sample Mean Sample Variance Pooled Variance df Critical Value Used Day 1 5 2.10 0.0050 0.0061 8 Day 2 5 2.28 0.0072 Note: Because the sample sizes were equal in this example, the pooled variance is just the average of the two sample variances.
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[DOCX File]AMS572
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Please compare training programs 3 and 4 using the usual pooled-variance t-test at the significance level . α=0.05. At α=0.05, please compare training programs 3 and 4 using an optimal test – that is, the best test you can find based on the given data – this test should be better than the pooled variance t …
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[DOCX File]The Taste of Yellow
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Since the students determined that a pooled t -test is appropriate, the pooled variance estimate must be calculated prior to the computation of the test statistic. The equation for the estimated pooled variance is: ... or their graphing calculator to determine the p-value: P-value=2P t 51 ≤-.66 =2 .256 =.51 .
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[DOC File]Z-test for Means Formulas
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The only twist here is that you’ll need to compute the pooled variance for the t-test (see the formula) based on the sample variances. You can begin by entering the data for each group into your calculator and filling in the table of descriptive statistics below.
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[DOCX File]Choice Theory & Motivation - LaGrange College
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According to Salkind (2010), effect size indices measure the degree to which the treatment was effective and are not dependent upon sample size. An effect size calculator was used to compute Cohen’s d for determining whether the effect size was small (d = 0.0 – 0.20), medium (d …
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[DOC File]Problem Set #1
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Note: The sample sizes are different. N is greater for weight-watchers than it is for the Atkins Diet. This should throw a red flag in your brain suggesting you calculate a pooled variance. This is basically assuming equal variances for both Atkins and Weight Watchers treatment. This will be a t-test due to small sample size. Here is the JMP ...
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[DOC File]Example of Diagnostics for Residuals
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Calculator Maintenance Data Using EXCEL. First, we begin with the original data. I have sorted it with respect to the predictor variable (X = number of machines serviced). Note that in this case we wish to preserve the pairs (Xi,Yi). To do this: ... Fifth, Compute the pooled variance s2:
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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]StatAnalysis-PartOne
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So, MSE = Sp2 and the test becomes the pooled variance two-sample t-test. The assumptions of one-way analysis of variance will look rather familiar: normality, constant variance, and independence. These are the same as in the two-sample t-test, and, with the exception of not needing the linearity assumption, the same as in regression.
pooled variance formula

[DOC File]Guide to calculating, interpreting and using effect size
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For these reasons, it is often better to use a ‘pooled’ estimate of standard deviation. The pooled estimate is essentially an average of the standard deviations of the experimental and control groups (Equation 4). Note that this is not the same as the standard deviation of all the values in both groups ‘pooled’ together.
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Pooled variance calculator