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when two use t test and when two use z test i am totally confused aloso...

when two use t test and when two use z test

i am totally confused

aloso explain when two sample are given

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Answer #1

In case of large number of samples, the Binomial distribution and Poisson distributions are approximated by the Normal distribution. In such case, we apply Z-test or Normal test which is based on the area property of Normal probability curve.

In case of small number of samples (n<30), the distribution of various Statistics are far from normality and normal test can not be applied to such samples.In such case, we apply T-test or, Student Fisher t-test and student Fisher t-distribution curve is used for such purpose.

As number of sample is two , we should apply the t-test.

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