Casio FX-9860GII-L-IH User Guide - Page 339
Sample, Interval
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6-6-4 Confidence Interval 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 (Displayed only for Data: List setting.) n size of sample u 2-Sample Z Interval 2-Sample Z Interval calculates the confidence interval for the difference between two population means when the population standard deviations of two samples are known. The following is the confidence interval. α is the level of significance. The value 100 (1 - α) % is the confidence level. Left = (o1 - o2) - Z α 2 Right = (o1 - o2) + Z α 2 σ12 n1 + σ22 n2 σ12 n1 + σ22 n2 o1 : mean of sample 1 o2 : mean of sample 2 σ1 : population standard deviation of sample 1 σ2 : population standard deviation of sample 2 n1 : size of sample 1 n2 : size of sample 2 Perform the following key operations from the statistical data list. 4(INTR) 1(Z) 2(2-S) 20050401