18166454
Description
Quiz by Katie Morbey, updated more than 1 year ago
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Created by Katie Morbey
over 5 years ago
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Question 1
Question
What assumption does ANCOVA have that ANOVA does not?
Answer
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Homogeneity of variance
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All assumptions of ANCOVA can be applied to ANOVA
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Homogeneity of regression slopes
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Assumptions of normality
Question 2
Question
ANCOVA is __________
Answer
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A robust version of ANOVA
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An extension of ANOVA that partials out the effect of other measured variables
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A method of portioning the results of ANOVAs to investigate where differences between independent variables lie
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Used to correct for unmeasured variables that could affect the outcome variable
Question 3
Question
A researcher conducted a study to examine whether people’s attachment styles are associated with differences in relationship satisfaction. Participants were divided into three groups according to their attachment styles (secure, dismissing, and fearful) and their relationship satisfaction was measured. Depression levels were also measured, as it is known that relationship satisfaction covaries with depression. Which variable should the researcher use as a covariate in the data analysis?
Answer
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Depression
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Relationship satisfaction
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Attachment style
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Secure attachment
Question 4
Question
Regarding the study described in Question 3, which of the below questions would be relevant to the data analysis?
Answer
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What would the mean depression score be for the three groups of attachment styles if their levels of relationship satisfaction were constant?
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What would the mean relationship satisfaction be if levels of depression were constant?
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Does relationship satisfaction have a significant effect on the relationship between attachment and depression?
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What would the means of the groups be on relationship satisfaction if their levels of depression were constant?
Question 5
Question
What problem do you foresee with the study described in Question 3?
Answer
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Depression might also be related to attachment style
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It is likely that the regression lines will be parallel
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There could be more than three groups
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It is likely that there will be a linear association between depression and relationship satisfaction
Question 6
Question
The larger the F statistic, the larger the _____________ compared to the _________
Answer
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Variation between groups; total variation
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Variation between groups; variation within groups
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Total variation; variation between groups
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Variation within groups; variation between groups
Question 7
Question
A covariate is best described as _________
Answer
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A variable that is related to the independent variable
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A variable that is directly influenced by the dependent variable
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A variable that is unrelated to all other variables in the study
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A variable that is related to the dependent variable
Question 8
Question
A researcher wanted to see whether giving students caffeine would improve their memory. He gave all students a memory test, then he randomly assigned participants to two groups. One group received a caffeinated drink and the other group received a decaffeinated drink. Both groups then took another memory test (with different questions). The researcher used ANCOVA to analyse the data. Which variable was the covariate?
Answer
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Score on the second memory test
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Caffeine
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There was no covariate
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Score on the first memory test
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