Preliminary Issues Measurement Scales STAR Test Results Classification of Research Research Validity Research Designs Research Designs and Validity Steps in the Research Process Operational Definitions Mediator vs Moderator Sampling Designs Frequency Distributions Frequency Distributions in Stata More on Histograms Distribution Shapes The Distribution of Percentiles Measures of Central Tendency D'oh!: Simpson's Paradox By All Means Measures of Variability A Tale of Three Variances Skew U. The Story of Kurtosis Exploratory Data Analysis Football Numbers About Summation Signs Ethical Issues in Research Raw Scores, Deviation Scores & Standard Scores Standard Scores & the Normal Distribution Scatterplots and Correlation More Correlations Regression Prediction Practice Where do we go from here? Sampling Distributions Sampling Distributions Illustrated Chebyshev's Theorem Midterm Results Probability Logic of Hypothesis Testing Between vs Within Subjects Designs Testing Means (normal distribution) Testing Means (t distribution) Effect Size Interval Estimation Testing Proportions Testing Variances (F distribution) Analysis of Variance (F distribution) Nonparametric Tests Permutation Tests Testing Frequencies (chi-square distribution) Contingency Tables/Crosstabulations Hypothesis Testing Overview Probability Distributions Test Reliability and Validity Measurement and Testing

Research Example in the News Statistics in the News Education Example in the News Response to previous article Data addendum to previous articles The Rand Texas report Newspaper article -- about Rand report The myth of the Texas miracle in education More on Texas myth Commentary on Rand report API Article Newspaper article -- regression A validity critique of language program evaluations

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