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Because this test is twotailed that figure is doubled to yield a probability of 00178 that the population means are the same if the test had been conducted at a prespecified significance level of α lt 005 the null hypothesis of equal means could be rejected if the specified significance level had been the more conservative more stringent α lt 001 however the null hypothesis could not be rejected.
Ttest for the significance of the difference between the means of two independent samples this is probably the most widely used statistical test of all time and certainly the most widely known it is simple straightforward easy to use and adaptable to a broad range of situations.
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The twosample ttest is one of the most commonly used hypothesis tests in six sigma work it is applied to compare whether the average difference between two groups is really significant or if it is due instead to random chance.
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Independent twosample ttest equal sample sizes equal variance given two groups 1 2 this test is only applicable when the two sample sizes that is the number n of participants of each group are equal it can be assumed that the two distributions have the same variance violations of these assumptions are discussed below.
The best time to take a pregnancy test is after your period is late this will help you avoid false negatives and the false positives of very early miscarriages if youre not already keeping a fertility calendar proper pregnancy test timing is a good reason to start one.
The test of two independent correlations is just a z test of the difference of the fishers z transformed correlations divided by the standard error of the difference see cohen et.