This Degrees of Freedom Calculator will indicate the number of degrees of freedom for two samples of data, with sample sizes n1 and n2
Two-Tailed Test One-Tailed Test Select Alpha Level: .05 .01 Number of Rows: [10] [30] [50] [100] [250] Group A Group BDescriptive Statistics MeanStandard Deviationn Group A 0 0 0 Group B 0 0 0 Independent Samples t-Test t-Statistic 0Result Degrees of Freedom 0 Critical...
To estimate the confidence we need to calculate t-value, and then lookup the inverse of CDF of Student's t-distribution with degrees of freedom. is the size of sample A and is the size of sample B. To find t-value you start from calculating the mean and sum of squared deviations, or...
dfis the degrees of freedom (df= 16), p-valueis the significance level of thet-test(p-value = 0.01327). conf.intis theconfidence intervalof the mean at 95% (conf.int = [4.0298, 29.748]); sample estimatesis he mean value of the sample (mean = 68.9888889, 52.1). ...
sample estimates: mean in group Man mean in group Woman 73.21 51.25 As you can see, the two methods give the same results. In the result above :tis the Studentt-test statisticsvalue (t = 3.17),dfis the degrees of freedom (df= 17.916),p-valueis the significance level of thet-test(...
What if the population standard deviations are known? The main purpose of this calculator is for comparing two population mean when sigma is unknown for both populations. In case that the population standard deviations are known, then you should use instead thisz-test for two means....
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Stata informs us that the χ2 associated with this table has 6 degrees of freedom and is 61.29. The observed differences are significant. The table is, perhaps, easier to understand if we suppress the frequencies and print just the row percentages: . tabulate region agecat, row nofreq chi2...
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Instructions:This calculator conducts a Z-test for two population means (\(\mu_1\) and \(\mu_2\)), with known population standard deviations ( \(\sigma_1\) and \(\sigma_2\)). Please select the null and alternative hypotheses, type the significance level, the sample means, the popula...