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Unformatted text preview: Chapter 10 part 2 Ttest and Ftest Both are used to analyze data in experimental research Analysis of TwoGroup Experiments • The t Test: – The error variance in the data is calculated to determine how much the means are expected to differ due solely to random chance – The observed means between the means are then compared to this estimate – If the means are large enough relative to this estimate then the null hypothesis is rejected The t Test 1) Calculate the means of the two groups 2) Calculate the standard error of the difference between the two means 3) Find the calculated value of t 4) Find the critical value of t 5) Determine whether the null hypothesis should be rejected by comparing the calculated value of t to the critical value of t Calculating the variance 1. find the mean 2. subtract the mean from each score – This is the deviation score 3. Square the deviation score 4. Add the squared deviation scores – This is the Sums of Squares 5. Divide the Sums of Squares by n1 “n” = the number of participants 6. Square root of sums of squares = standard deviation Calculating Variance and the Standard Deviation Participant Score Deviation Score Squared Deviation 1 4 45.6=1.6 1.6^2=2.56 2 5 55.6=.6.6^2=.36 3 9 95.6=3.4 3.4^2=11.56 4 10 105.6=4.4 4.4^2=19.36 5 05.6=5.65.6^2=31.36 Mean=5.6 Calculating Variance and the...
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This note was uploaded on 03/30/2008 for the course PSYC 2094 taught by Professor Trcunningham during the Fall '07 term at Virginia Tech.
 Fall '07
 TRCunningham

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