HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 140
Two-Sample T-Test
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hp40g+.book Page 14 Friday, December 9, 2005 1:03 AM Two-Sample T-Test Menu name Inputs T-Test: μ1 - μ2 The Two-sample T-Test is used when the population standard deviation is not known. On the basis of statistics from two samples, each sample from a different population, this test measures the strength of the evidence for a selected hypothesis against the null hypothesis. The null hypothesis is that the two populations means are equal H 0: μ1 = μ2. You select one of the following alternative hypotheses against which to test the null hypothesis The inputs are: H1:μ1 < μ2 H1:μ1 > μ2 H1:μ1 ≠ μ2 Field name x1 Definition Sample 1 mean. x2 Sample 2 mean. S1 Sample 1 standard deviation. S2 Sample 2 standard deviation. n1 Sample 1 size. n2 Sample 2 size. α Significance level. _Pooled? Check this option to pool samples based on their standard deviations. 11-14 Inference aplet