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##### Use Common Statistical Tests to Draw Conclusions from Data db 3

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You're trying to explain null and alternative hypotheses to one of the senior managers at Company W and he's not "getting it" when you use s

Apr 24th, 2014

We are going to compare multiple groups (beyond two) on the basis of sample means. Suppose we want to compare the effects of more than 2 different food supplements on children height. So in this case we ran an experiment to compare the effects of 3 supplements. This can be translated in testing the null hypothesis that the mean heights of children is equal whatever they received (supplement 1, supplement 2 or supplement 3) against the alternative that at least one of three supplement’s treatment is different from others i.e.; three supplements do not create the same effects on children height.

H0: μSUPLEMENT1 = μSUPLEMENT2 = μSUPLEMENT3

Ha:  At least one of the three is different from the others.

Based upon this test we can get know whether we could reject the null hypothesis or accept the alternative hypothesis and vice versa. This test tells us that small differences between sample means are usually present but it is not confirmed that they are significant. It is further noticed that the general alternative does not clearly specify which sample means are different from one another but only there exist some differences.

Apr 26th, 2014

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Apr 24th, 2014
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Apr 24th, 2014
Sep 23rd, 2017
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