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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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 Fall '07
 TRCunningham

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