lab 7

# lab 7 - EXST 7005 Fall 2010 Lab #7: Independent Two-Sample...

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EXST 7005 Fall 2010 Lab #7: Independent Two-Sample T-Test Different from a one-sample t-test which compares the mean of a sample with a certain number, a two-sample t-test is comparing the means of two samples which are randomly drawn from two populations. The two samples are assumed to be independent and their variances can be equal or unequal. (If the two samples are not independent, the independent two-sample t-test is inappropriate. Instead, we should use the paired-sample t-test if their sample sizes are equal.) Example: The effect of alcohol consumption on the body appears to be much greater at high altitudes than that at sea level. To test this theory, a scientist randomly selects 13 subjects and randomly divides them into two groups, the first group contains 6 subjects and the second group contains 7 subjects. The first group is put into a chamber that simulates conditions at an altitude of 12,000 feet, and each subject ingests a drink containing 100 cubic centimeters (cc) of alcohol. The second group receives the same drink in a chamber that simulates conditions at sea level.

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## This note was uploaded on 12/29/2011 for the course EXST 7005 taught by Professor Geaghan,j during the Fall '08 term at LSU.

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lab 7 - EXST 7005 Fall 2010 Lab #7: Independent Two-Sample...

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