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analysis anova anova model averages binomial distribution categorical data categorical predictor chi-square chi-square test classification cluster analysis clustering coefficient comparison confidence interval continuous data correlation correlation coefficient correlation test data data analysis data mining datasets distribution econometrics estimation excel exponential distribution factor analysis forecasting frequency glm hierarchical homework hypothesis hypothesis testing independent interaction kruskall wallis likert likert scale linear model linear regression logistic regression logit mann-whitney manova mixed design model modeling multilevel models multiple regression multivariate normal normal distribution normality normalization outliers p-value percentages percentile populations prediction probability probability distribution probability distributions probability help proportions psychology random samples regression regression analysis reliability repeated measures repeated measures anova research sample sample size sas scale shapiro-wilk significance spss standard deviation standard error statistical analysis statistical significance statistical test statistics stats survey t-test test time series time series regression ttest variability variance weighting wilcoxon