Quiz 3 Flashcards
• What are factorial designs?
o When the effects of two or more variables are examined at the same time by making groupings of every combination of variables
• Basic logic of designs
o With factorial designs, you can study both variables at one, without needing twice the participants
o Interaction effects
• two-way designs
factorial research design for analysis of variance with two variables that each divide the groups
• main effect
result for a grouping variable, averaging across the levels of the other grouping variable
• grouping variables
a variable that separates groups in analysis of variance
• cells
in a factorial design, particular combination of levels of the variables that divide the group
• cell means
the mean of a particular combination of levels of the variables that divide the groups
• marginal means
in a factorial design in analysis of variance, mean score for all the participants at a particular level of one of the grouping variables
o Identifying effects in words and numbers
Words: you have an interaction effect when the effect of one grouping variable varies according to the level of another grouping variable
Numerically: look at the pattern of the cell means. If there’s an interaction effect, the means will not be the same
• What is a chi-square test?
o Used when the scores are on a nominal variable (variable with values that are categories)
• Goodness of fit vs. test of independence
o Goodness of fit: test involving levels of a single nominal variable
o Independence: used when there are two nominal variables, each with several categories
• Observed frequencies
the number of individuals actually found in the study to be in a category
• Expected frequencies
the number of people in a category expected if the null hypothesis were true
• What is meant by independence?
o The situation of no relation between two variables in a chi square test
• What is a cell in a chi square test?
o The particular combination of categories for two variables in a contingency table
