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