SOCR EduMaterials AnalysisActivities TwoPairedT

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(Two Paired Sample T-Test Example)
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'''2.''' Click on the "'''Mapping'''" button to get to the "'''Mapping'''" panel. Click on '''"Add"''' under '''Dependent''' to add the variable for One Sample T-Test. Here, the Column X = B - A. Don't worry about C2 to C16 etc.
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'''2.''' Click on the "'''Mapping'''" button to get to the "'''Mapping'''" panel. Click on '''"ADD"''' under '''VARIABLE 1''' and to '''VARIABLE 2''' add the variables for Two Paired Sample T-Test. You can just add column '''A''' to '''VARIABLE 1''' and '''B''' to '''VARIABLE 2'''.
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Here, the computer will set difference = Variable 2 - Variable 1. If you like the substraction to go the other way around, simple assign '''VARIABLE 1''' and '''VARIABLE 2''' in a different way.  
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Questions for students: By looking at the test results, what do you think about the data? What can you say about the two different shoe materials?
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'''Questions for students:''' By looking at the test results, what do you think about the data? What can you say about the two different shoe materials?

Revision as of 19:49, 4 August 2007

Two Paired Sample T-Test Example

We will demonstrate Two Paired T-Test with some SOCR built-in examples. This example is based on the data taken from the statistical program "R." For more information of the R program, please see CRAN Home Page. The dataset used here is "shoes" under R's "MASS" library. In the dataset, ten boys are given to the wear of shoes of materials A and B for one foot. We'd like to find if one material is better than the other.


Here's the steps of the activity:

1. Click on Two Paired Sample T-Test at the left panel's combo box.



On the right panel, first click on EXAMPLE 3 and next click on "Data" to retreive the demonstrated example. This is the example we'll be looking at.Note that the data are difference of B - A.


2. Click on the "Mapping" button to get to the "Mapping" panel. Click on "ADD" under VARIABLE 1 and to VARIABLE 2 add the variables for Two Paired Sample T-Test. You can just add column A to VARIABLE 1 and B to VARIABLE 2. Here, the computer will set difference = Variable 2 - Variable 1. If you like the substraction to go the other way around, simple assign VARIABLE 1 and VARIABLE 2 in a different way.



3. Click on "Calculate" then "Result" to see the results.



Questions for students: By looking at the test results, what do you think about the data? What can you say about the two different shoe materials?

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