# SOCR EduMaterials AnalysisActivities TwoPairedT

### From Socr

(→Two Paired Sample T-Test Example) |
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- | '''2.''' Click on the "'''Mapping'''" button to get to the "'''Mapping'''" panel. Click on '''" | + | '''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. | ||

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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? | + | '''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?