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Statistics 305 Exam Questions and Answers

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Statistics 305 Exam Questions and Answers The independent variable is also called the ---> - ANSWER-Factor or treatment variable Factorial designs involve more than one _____ with two ore more _____. - ANSWER-Factorial designs involve more than one IV with two or more levels. how many group...

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  • November 4, 2024
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Statistics 305 Exam Questions and

Answers


The independent variable is also called the ---> - ANSWER✔✔-Factor or treatment variable


Factorial designs involve more than one _____ with two ore more _____. - ANSWER✔✔-Factorial

designs involve more than one IV with two or more levels.


how many groups are required in a One-way Anova? - ANSWER✔✔-Two groups or more.


Why not just test all the possible differences of a one way design with t test? - ANSWER✔✔-This would

lead to an inflated experiment wise type I error rate (i.e. rejection of a true null hypothesis)


Two types of tests in ANOVA? - ANSWER✔✔-Omnibus F tests


Post hoc test to look at pairs of groups


What are two things which are provided to us by performing post hoc tests? - ANSWER✔✔-1. Post hoc

tests give us better type I error control


2. You only interpret the post hoc test if the overall F test is significant.


_______ assesses the relative magnitude of different parts of variance. - ANSWER✔✔-ANOVA


Define the MSM --> - ANSWER✔✔-Mean squared of the model. This is variance which is found between

groups that is due to the independent variable or different treatments/levels of a factor


What is the other name for the variance within groups? - ANSWER✔✔-MSR



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If the group means tend to differ from each other what happens to MSM? - ANSWER✔✔-MSM tends to

be large in comparison to MSR ---> in turn when the group means differ from each other the F ration

tends to be large.


The most common form of graph is _____ for and F distribution? - ANSWER✔✔-Right skewed

distribution


If your F value is larger than F crit you may _____ the null hypothesis. - ANSWER✔✔-Reject.


If the p value is less than 0.05 you may _____ the null hypothesis. - ANSWER✔✔-Reject


With only two groups either a ____ test or an F tests can be used for testing for significance between

means. - ANSWER✔✔-t test!


When there are only two groups both F tests and t tests lead to the same conclusion T/F. - ANSWER✔✔-

T


When group number is 2, F = ____ - ANSWER✔✔-F = t^2 when there are two groups.


In one way anova, SST is partitioned into SSM and SSR. Where does it go from there? - ANSWER✔✔-SSM

will lead to MSM


SSR will lead to MSR


F = MSM/MSR


SST = _____ + ______ - ANSWER✔✔-SST = SSM + SSR


SSM = Variation ___________ - ANSWER✔✔-SSM = variation between the sample means (across the

levels of IV)




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