Casio FX-9860GII-L-IH User Guide - Page 344
calculates the confidence interval for the difference between two
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6-6-9 Confidence Interval o mean of sample xσn-1 sample standard deviation (xσn-1 > 0) n size of sample (positive integer) After setting all the parameters, use c to move the highlighting to "Execute" and then press the function key shown below to perform the calculation. • 1(CALC) ... Performs the calculation. Calculation Result Output Example Left confidence interval lower limit (left edge) Right confidence interval upper limit (right edge) o mean of sample xσn-1 sample standard deviation n size of sample u 2-Sample t Interval 2-Sample t Interval calculates the confidence interval for the difference between two population means when both population standard deviations are unknown. The t interval is applied to t distribution. The following confidence interval applies when pooling is in effect. α is the level of significance. The value 100 (1 - α) % is the confidence level. Left = (o1 - o2)- tn1+n2 -2 α 2 xp σ 2 n-1 1 n1 + 1 n2 Right = (o1 - o2)+ tn1+n2 -2 α 2 xp σ n-12 1 n1 + 1 n2 xpσn-1 = (n1-1)x1σ n-12 +(n2-1) x2σn-12 n1 + n2 - 2 20050401