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Introduction to Statistics
Introduction to Statistics

Data Analysis Planning and performing data analysis is an important
Data Analysis Planning and performing data analysis is an important

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... If the observed difference is greater than or equal to the difference that would occur 5 times in 100 by random chance, the null hypothesis is considered questionable, and the difference is judged to be significant. Other significance levels, such as 0.01 (1%) or 0.001 (0.1%), may also be adopted, ...
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... of treatment effect can be viewed as a weighted sum of uncorrelated, approximately normally distributed statistics computed on the groups accrued between analyses. This is often referred to as “independent increment structure”, and this holds in a wide variety of common clinical trial settings. In t ...
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... Unit 31: One-Way ANOVA Summary of Video A vase filled with coins takes center stage as the video begins. Students will be taking part in an experiment organized by psychology professor John Kelly in which they will guess the amount of money in the vase. As a subterfuge for the real purpose of the ex ...
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21.statistics - Illinois State University Department of Psychology

... relationship between study time and test performance. Computation of the Correlation Coefficient (and regression) - a numerical description of the relationship between two variables May be used for ...
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analysis of variance

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... measurements are taken on pairs of related observational units such as twins. In dietary studies with two diets under investigation, for example, it is common that the subjects try one diet in one period and the other diet in another period; thus, they are “dependent.” As a consequence, the betweeng ...
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... SS y = SS x 1 + SS x 2 + SS x 1x 2 + SS error The strength of the joint effect of two factors, called the overall effect, or multiple  2, is measured as follows: ...
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1 . 2 . 3 . 4 . 5 - Stanford University

... and increase or decrease the width. ...
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ANOVA Example 1 from Mon, Nov 24 (GPA by seat location)

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hypothesis testing

... 1. Formulate H1and H0 One-Tailed Versus Two-Tailed Tests • The form of the alternative hypothesis can be either a one-tailed or two-tailed, depending on what you are trying to prove. • A one-tailed hypothesis is one where the only sample results which can lead to rejection of the null hypothesis ar ...
Lecture 12 - University of Pennsylvania
Lecture 12 - University of Pennsylvania

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Analysis of variance



Analysis of variance (ANOVA) is a collection of statistical models used to analyze the differences among group means and their associated procedures (such as ""variation"" among and between groups), developed by statistician and evolutionary biologist Ronald Fisher. In the ANOVA setting, the observed variance in a particular variable is partitioned into components attributable to different sources of variation. In its simplest form, ANOVA provides a statistical test of whether or not the means of several groups are equal, and therefore generalizes the t-test to more than two groups. As doing multiple two-sample t-tests would result in an increased chance of committing a statistical type I error, ANOVAs are useful for comparing (testing) three or more means (groups or variables) for statistical significance.
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