Casio FX-9860GII-L-IH User Guide - Page 323
mean of sample 1, standard deviation
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6-5-13 Tests u 2-Sample t Test 2-Sample t Test compares the population means when the population standard deviations are unknown. The 2-Sample t Test is applied to t-distribution. The following applies when pooling is in effect. t = o1 - o2 xp σ n-12 1 n1 + 1 n2 xpσn-1 = (n1-1)x1σ n-12 +(n2-1) x2σn-12 n1 + n2 - 2 df = n1 + n2 - 2 o1 : mean of sample 1 o2 : mean of sample 2 x1σn-1 : standard deviation of sample 1 x2σn-1 : standard deviation of sample 2 n1 : size of sample 1 n2 : size of sample 2 xpσn-1 : pooled sample standard deviation df : degrees of freedom The following applies when pooling is not in effect. t = o1 - o2 x1σ n n1 + -12 x2σ n -12 n2 df = 1 C2 n1-1 +(1n-2-C1)2 C = x1σ n-12 n1 x1σn1n-12+ x2 σn-12 n2 o1 : mean of sample 1 o2 : mean of sample 2 x1σn-1 : standard deviation of sample 1 x2σn-1 : standard deviation of sample 2 n1 : size of sample 1 n2 : size of sample 2 df : degrees of freedom Perform the following key operations from the statistical data list. 3(TEST) 2(t) 2(2-S) 20050401