Ten individuals are chosen at random, from a normal population and their weights (in kg) are
found to be 63, 63, 66, 67, 68, 69, 70, 70, 71 and 71. In the light of this data set, test the claim
that the mean weight in population is 66 kg at 5% level of significance.
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to find the mean we have to find the average :
(63+63+66+67+68+69+70+70+71+71)/10 = 67.8
(63+63+66+67+68+69+70+70+71+71)/10 = 67.8
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