# Shared Flashcard Set

## Details

Statistics
Independent measures and correlated groups t tests (chapter 11)
9
Mathematics
05/08/2007

Term
 How do independent measures and correlated groups t test differ?
Definition
 Independent Measures:- 2 separate samples- presumed to come from 2 separate populationsCorrelated Groups- single sample from single population used twice on the same dependent variable- 2 samples from same population
Term
 Provide examples for a correlated groups t test.
Definition
 - Before vs. After- Cond. 1 vs. Cond. 2, - Score at Time 1 vs. Score at Time 2
Term
 What advantages are there to running a correlated groups t test?
Definition
 - more variables ascertained and controlled- more realistic design than 1 sample t and z- donâ€™t need parameters like μ and σ- SS can be own control group (in repeated measures)
Term
 What is the difference between repeated measures and matched pairs design?
Definition
 repeated measures: - single sample randomly selected and generates 2 sets of data- don't need a control group because the sample is own controlmatched pairs:- 2 heavily matched samples taken from single population and measured one time- matched on as many variables as possible
Term
 What are the mechanics of a correlated groups t test?
Definition
 - collect 2 sets of data in Correlated Groups t test - but use only 1 set of data called Difference Scores (D) --> all calculations use sample Difference scores in Correlated Groups t test.- makes this a 2 sample t test that looks like a 1 sample t test
Term
 Hypotheses:
Definition
 Ho : μD = 0 Hi : μD ≠ 0
Term
 What is represented by the denominator of this hypothesis test?
Definition
 Smd (standard error of sample means) = estimated standard error for the Difference scores.It is how much we can expect between MD and μD to differ based on chance alone
Term
 The sampling distribution for a correlated groups t test is what?
Definition
 all the possible values of differences you can get between 2 scores on the x axis and the probability of getting those scores (y axis
Term
 Denominator of an independent measures t test is...
Definition
 sM = estimated standard error of the mean (estimated σM) where σ is unknown and we have to rely on the sample s to know how much difference we can expect between M and μ based on chance alone
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