Statistical significance examples stats

    • [DOC File]Sampling and Sample Size - Columbia University

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      Statistical significance versus practical/clinical significance (or importance): Statistical significance means that a difference is “real” and not just due to sampling variability or chance. That is, the difference would persist if the study were repeated with new random samples.

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    • [DOC File]AP Statistics

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      Graded assignments Computer assignments, multiple choice packets, cumulative reviews and reading assignments, will be scored on their statistical accuracy, organization, appearance, and communication quality. They will range in value. Notebook You will be required to keep a Stats only notebook containing the following items.

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    • [DOC File]Chi-sq explanation - Radford University

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      CHI-SQUARE TEST EXPLANATION. Let’s say you want to know if there is a difference in the proportion of men and women who are left handed and let’s say in …

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    • Statistics for AKT

      Once the level of statistical significance to be shown has been chosen then the power of the study is used to calculate the sample size needed. Power = probability of the study rejecting the null hypothesis when it is false (ideally should be >95%). This is affected by the sample size, treatment effect size and the p value to be demonstrated.

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    • [DOC File]Review of Basic Statistical Concepts

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      The smallest significance level at which you would reject H0. The p-value is calculated from the test statistic, and is doubled for two-sided tests. Note: and the p-value are the “before” and “after” significance levels for the test. We can reach a decision to accept or reject H0 by comparing the two significance levels.

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    • [DOCX File]Statistical Tests - Loudoun County Public Schools

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      21. What is the meaning of a two-tailed test? If you are using a significance level of alpha = 0.05, a two-tailed test allots half of your alpha to testing the statistical significance in one direction and half of your alpha to testing statistical significance in the other direction.

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    • [DOC File]The table is a useful device for condensing and presenting ...

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      Correlation and Regression Examples. Table 5 provides a simple four-variable bivariate correlation matrix. Note the use of the asterisks and table note to identify level of significance. Table 6 provides a summary of the ANOVA for a simple regression equation. Table 5. Pearson Correlation Matrix among Benchmark Scale Scores and Global Ratings

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    • [DOC File]WRITING UP POWER ANALYSES - University of Queensland

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      Finally, limited statistical power because of the. modest sample size in the present study (N = 40) may have played. a role in limiting the significance of some of the statistical comparisons. conducted. A post hoc power analysis revealed that on the. basis of the mean, …

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    • [DOC File]Formula Sheet and List of Symbols, Basic Statistical Inference

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      Formula Sheet and List of Symbols, Basic Statistical Inference. Symbol What it Represents. X variable. sample mean. μ population mean. s sample standard deviation. s2 sample variance. σ population standard deviation. σ2 population variance. sample proportion. p population proportion. q 1-p. n sample size. α significance level

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    • [DOC File]Understanding Statistics by Using Spreadsheets to Generate ...

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      Concepts: statistical significance, p value, t test, magnitude-based inferences, smallest important value, standardized difference. Means in Two Groups Plus a Predictor It's one thing to compare the means of a dependent variable in two groups, but suppose the subjects on average differ between the groups in some other way that is related to the ...

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