Module 5 Equations/Tests 0.0 / 5 ? BiologyPractical applications of biologyEquationsA2/A-levelOCR Created by: RebeccaSmithySmithCreated on: 15-12-18 19:51 T-Test 1 of 3 T-Test Continued X1 = mean of the first sample X2 = mean of the second sample s1 = standard deviation of the first sample s2 = standard deviation of the second sample N1 = number of measurements in the first sample N2 = number of measurements in the second sample 2 of 3 Hypothesis (Null) Null = no significant difference (Ha) = significant difference If t exceeds significant (critical value) then we reject the null hypothesis 3 of 3
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