Ttest_Independent_Samples_08

Ttest_Independent_Samples_08 - T-test for Independent...

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T-test for Independent Samples (Between-subjects design) it is used to analyze data from a research design that uses two separate samples (i.e., between-subjects design) in a simple experimental design one sample might receive experimental treatment and the 2 nd sample serves as a control group in a quasi –experimental design a researcher might want to compare two populations (e.g., male and female); each sample represents one population the research question to be tested: Is there a significant difference in average performance Is there a significant difference in average performance (i.e., dependent variable) (i.e., dependent variable) between Group 1 and Group 2? between Group 1 and Group 2?
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Examples of research problems : (1) Quasi-experiment A researcher measured stress level in a sample of undergraduate students and would like to know if there are gender differences in how much stress students report (= is there a difference in stress level between male and female students). The amount of reported stress in gender groups is compared by the t test for independent samples. (2) Experiment A researcher would like to know if stress has an effect on the test performance ( = is there a difference in the test performance between the groups that work under different amount of stress) He/she randomly
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This note was uploaded on 11/12/2009 for the course PSY 3301 taught by Professor Staff during the Fall '08 term at Texas State.

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Ttest_Independent_Samples_08 - T-test for Independent...

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