Paired Sample t-Test
This test is used to compare the means of two related groups
What is the dependent-samples t-test (or paired-samples t-test)?
The acronym for a test used to compare the means of more than two groups
What is ANOVA?
An ANOVA with two independent variables is called this
What is a two-way ANOVA? What is a factorial ANOVA?
This value, which ranges from -1.0 to +1.0, is a measure of the strength and direction of a linear relationship between two variables
What is the correlation coefficient (or Pearson's r)?
The variable you are trying to predict in a regression equation
What is the dependent variable?
The type of t-test used when you have two scores for the same participants, such as a pre-test and a post-test
What is a dependent samples t-test?
The type of variance that measures the differences between the group means
What is between-group variance?
The term for the effect of a single independent variable on the dependent variable
What is a main effect?
When the correlation coefficient is close to -1.0, what does that indicate about the relationship between the two variables?
What is a strong negative (or inverse) relationship?
The variable used to make the prediction
What is the independent variable (X)?
When you subtract the post-test score from the pre-test score, you are left with these, which are the values you analyze
What are difference scores?
The ratio of between-group variance to within-group variance
What is the F-ratio?
The most interesting result in a two-way ANOVA, it occurs when the effect of one independent variable depends on the level of the other independent variable
What is an interaction?
A correlation of 0.85 between hours studied and test scores suggests a strong positive relationship. However, the textbook warns that this does not imply this type of relationship.
What is causation (or cause and effect)?
The best-fitting straight line that summarizes the relationship between two variables on a scatterplot
What is the regression line? What is the least-squares regression line?
When comparing two related groups, your null hypothesis states that the average difference score in the population is equal to this
What is zero?
This type of test is performed after a significant ANOVA result to determine which specific groups are different from each other
What is a post hoc test?
If the lines on an interaction plot are parallel, this means there is no this
What is no interaction?
If a scatterplot of two variables shows a random cloud of points with no discernible pattern, you would expect the correlation coefficient to be close to this value
What is 0 (or zero)?
The term for the difference between the actual score and the predicted score
What is a residual or error?
A measure of effect size for this test is often represented by Cohen's d, in addition there is another measure. What proportion of the variance in the dependent variable can be predicted from the independent variable(s)?
What is the coefficient of determination (r^2)?
The main reason we use an ANOVA instead of multiple t-tests is to avoid inflating this
What is the Type I error rate?
The three F-ratios you calculate in a two-way ANOVA
What are F for Factor A, F for Factor B, and F for the interaction?
According to Salkind and Frey, a coefficient of determination, or r^2 (R-squared), of 0.64 means that what percentage of the variance in one variable can be explained by the other variable?
What is 64 percent?
The equation used to predict a score based on another variable
What is Y'=bX+a?