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### 30 Cards in this Set

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 What is the formula for a z score? z=(x-mean)/standard deviation What is the within group degrees of freedom for ANOVA? N-k What is the between group degrees of freedom for ANOVA? k-1 What is the total degrees of freedom for ANOVA? N-1 What is the degrees of freedom for Factor 1 of ANOVA? # of factor 1 levels-1 What is the interaction degrees of freedom for ANOVA? The degrees of freedom for either factor Type I Error Erroneously reject the null hypothesis Type II Error Erroneously accept the null hypothesis What are the two main classes of statistics? Descriptive and inferential Variance= (score-mean)2/N-1 Standard deviation= Square root of variance How do you find the empirical t value in a t-test? Use t=(sample mean-population mean)/[standard deviation/(square root of N)] When do you use a t-test? When you're trying to determing whether it's likely that a sample stemmed from a population with a given mean Decision rules for a t-test If the observed t is between the critical values, do not reject the null hypothesis. If the observed t value is outside of the critical values, reject the null hypothesis. What is the 95% confidence interval? mean (+/-) 1.96(standard deviation/square root of N) If there are 20 people: 10 females and 10 men, what is the degrees of freedom? 18 How do you find the observed t value when you are trying to determine whether there are differences between two groups? mean1-mean2/long, complicated demonimator What is the 95% confidence interval using two groups? (mean1-mean2) (+/-) alpha t value(complicated denominator) When do you use a standard normal (z) distribution as opposed to the t-distribution? Use z when you know the population standard error. Use t when the error is estimated from the sample. What is the Pearson correlation coefficient symbolized by? r What is the degrees of freedom for Pearson's? N-2 How do you determine a percent of variance? r squared What kind of correlation would you use to test the relationship between rankings? Spearman rank order correlation (r sub s) Regression is used to... ...predict one variable from another Correlation is used to... ...find the degree of linear relationship between two variables If the F ratio approximates 1, that means... ...there is no treatment effect How many variables and levels are there in a 2x2x4 factorial design? 3 variables, 2, 2, and 4 factors How do you determine the number of levels from the degrees of freedom? Add one How do you determine the number of groups from the degrees of freedom? (dfA+1)(dfB+1) How do you find the total amount of between group variability? SStotal-SSwithin