Difference between revisions of "SOCR EduMaterials AnalysisActivities TwoIndepT"
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| + | ==Two Independent Sample T-Test Background== | ||
| + | Given two groups of data, not necessarily with same sample size, we'd like to test the null hpothesis that the two groups have equal mean. | ||
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==Two Independent Sample T-Test Example== | ==Two Independent Sample T-Test Example== | ||
| − | + | We will demonstrate Two Independent T-Test with a SOCR built-in example. | |
| − | We will demonstrate Two Independent | ||
This example is based on the data taken from "Mathematical Statistics and Data Analysis" by John A. Rice, Second Edition, Ducbury Press, 1995. (Page 390) | This example is based on the data taken from "Mathematical Statistics and Data Analysis" by John A. Rice, Second Edition, Ducbury Press, 1995. (Page 390) | ||
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| − | On the right panel, first click on '''EXAMPLE 1''' and next click on "Data" to retreive the demonstrated example. This is the example we'll be looking at | + | On the right panel, first click on '''EXAMPLE 1''' and next click on "Data" to retreive the demonstrated example. This is the example we'll be looking at. |
<center>[[Image:SOCR_AnalysisActivities_TwoIndepT_Chu_051707_Fig2.gif|700px]]</center> | <center>[[Image:SOCR_AnalysisActivities_TwoIndepT_Chu_051707_Fig2.gif|700px]]</center> | ||
| − | '''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 Independent Sample T-Test. We care about the difference, so which on goes to '''VARIABLE 1''' is arbitrary. | + | '''2.''' Click on the "'''Mapping'''" button to get to the "'''Mapping'''" panel. Click on '''"ADD"''' under '''VARIABLE 1''' and to add '''A''', and click on '''ADD''' under '''VARIABLE 2''' to add '''B'''. This will add the variables for Two Independent Sample T-Test. We care about the difference, so which on goes to '''VARIABLE 1''' is arbitrary. 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 the opposite way. |
| − | 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 | ||
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| − | '''3.''' Click on "'''Calculate'''" then "'''Result'''" to see the results. | + | '''3.''' Click on "'''Calculate'''" then click on "'''Result'''" to see the results. |
Revision as of 16:58, 6 August 2007
Two Independent Sample T-Test Background
Given two groups of data, not necessarily with same sample size, we'd like to test the null hpothesis that the two groups have equal mean.
Two Independent Sample T-Test Example
We will demonstrate Two Independent T-Test with a SOCR built-in example. This example is based on the data taken from "Mathematical Statistics and Data Analysis" by John A. Rice, Second Edition, Ducbury Press, 1995. (Page 390)
Here's the steps of the activity:
1. Click on Two Independent Sample T-Test at the left panel's combo box.
On the right panel, first click on EXAMPLE 1 and next click on "Data" to retreive the demonstrated example. This is the example we'll be looking at.
2. Click on the "Mapping" button to get to the "Mapping" panel. Click on "ADD" under VARIABLE 1 and to add A, and click on ADD under VARIABLE 2 to add B. This will add the variables for Two Independent Sample T-Test. We care about the difference, so which on goes to VARIABLE 1 is arbitrary. 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 the opposite way.
3. Click on "Calculate" then click on "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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