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ANOVA CNSL 503 EXAM|| || ACTUAL TEST
QUESTIONS AND 100% CORRECT ANSWERS
GRADED A+ LATEST AND COMPLETE UPDATE
WITH EXPERT VERIFIED SOLUTIONS || SURE
PASS!!
What is the mean square formula? - ANSWER- Mean Square=
Sum of Squares divided by its degrees of freedom
In ANOVA, mean squares are used to determine whether factors (treatments) are
significant.
Represents the variation between the sample means.
What is the purpose of a post-hoc test? - ANSWER- Purpose: Discover which
pairs of scores are significantly different
-Preserves FAMILY-WISE PROTECTION against Type I error
When do you look at post-hoc tests? - ANSWER- ONLY IF overall F value is
significant
What is a 2 way ANOVA? - ANSWER- 2 independent variables
What are the # of levels?
Ex:
You want to know how gait speed varies based on age and gender.
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Define IV, DV, and levels. - ANSWER- # of groups within each independent
variable
DV: Gait speed
IV: Age and Gender
3 levels (groups) for age
2 levels (groups) for gender
You want to test for sex differences in gait velocity among 3 age groups used
earlier.
What is an ANOVA? - ANSWER- ANOVA is an analysis of variance between
groups (or levels of a factor) or within groups (or error) Whereas t-tests compare
only two sample distributions, ANOVA is capable of comparing many. We
partition the total variance into how group means differ from the grand mean and
how individual observations within groups differ from their group's mean
What are the three assumptions of ANOVA? - ANSWER- 1. independence of
observations 2. normality 3. homogeneity of variance
What is the null hypothesis? - ANSWER- All means are equal
μ1 = μ2 = μ3 = μ4
What is the Alternative (one way) hypothesis? - ANSWER- μ1≠ μ2≠ μ3≠ μ4
(There is at least ONE difference between groups)
What is the "main effect"? - ANSWER- Average effect for each independent
variable.
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Main effect for sex (combing all ages)
"What is the effect of sex on gait speed? Is there a difference in gait speed if you're
male versus female? Do men and women have different gaits speeds?"
Main effect for age (combining both genders)?
"Does gait speed depend on age?"
What is the interaction ? - ANSWER- Is there an interaction BETWEEN the
independent variables?
Analyze all subgroups for significant differences
What do main effect and interaction effect have in common? - ANSWER-
Assessing effect of the IV
You want to test for sex differences in gait velocity among 3 age groups used
earlier.
What is the interaction asking? - ANSWER- Does the effect of gender (on gait
speed) DEPEND on how old you are?
Does the effect of age (on gait speed) DEPEND on sex?
or: For gait speed, is there a different trend of increasing age for women versus
men?
ANOVA CNSL 503 EXAM|| || ACTUAL TEST
QUESTIONS AND 100% CORRECT ANSWERS
GRADED A+ LATEST AND COMPLETE UPDATE
WITH EXPERT VERIFIED SOLUTIONS || SURE
PASS!!
What is the mean square formula? - ANSWER- Mean Square=
Sum of Squares divided by its degrees of freedom
In ANOVA, mean squares are used to determine whether factors (treatments) are
significant.
Represents the variation between the sample means.
What is the purpose of a post-hoc test? - ANSWER- Purpose: Discover which
pairs of scores are significantly different
-Preserves FAMILY-WISE PROTECTION against Type I error
When do you look at post-hoc tests? - ANSWER- ONLY IF overall F value is
significant
What is a 2 way ANOVA? - ANSWER- 2 independent variables
What are the # of levels?
Ex:
You want to know how gait speed varies based on age and gender.
, Page |2
Define IV, DV, and levels. - ANSWER- # of groups within each independent
variable
DV: Gait speed
IV: Age and Gender
3 levels (groups) for age
2 levels (groups) for gender
You want to test for sex differences in gait velocity among 3 age groups used
earlier.
What is an ANOVA? - ANSWER- ANOVA is an analysis of variance between
groups (or levels of a factor) or within groups (or error) Whereas t-tests compare
only two sample distributions, ANOVA is capable of comparing many. We
partition the total variance into how group means differ from the grand mean and
how individual observations within groups differ from their group's mean
What are the three assumptions of ANOVA? - ANSWER- 1. independence of
observations 2. normality 3. homogeneity of variance
What is the null hypothesis? - ANSWER- All means are equal
μ1 = μ2 = μ3 = μ4
What is the Alternative (one way) hypothesis? - ANSWER- μ1≠ μ2≠ μ3≠ μ4
(There is at least ONE difference between groups)
What is the "main effect"? - ANSWER- Average effect for each independent
variable.
, Page |3
Main effect for sex (combing all ages)
"What is the effect of sex on gait speed? Is there a difference in gait speed if you're
male versus female? Do men and women have different gaits speeds?"
Main effect for age (combining both genders)?
"Does gait speed depend on age?"
What is the interaction ? - ANSWER- Is there an interaction BETWEEN the
independent variables?
Analyze all subgroups for significant differences
What do main effect and interaction effect have in common? - ANSWER-
Assessing effect of the IV
You want to test for sex differences in gait velocity among 3 age groups used
earlier.
What is the interaction asking? - ANSWER- Does the effect of gender (on gait
speed) DEPEND on how old you are?
Does the effect of age (on gait speed) DEPEND on sex?
or: For gait speed, is there a different trend of increasing age for women versus
men?
