16-21. In order to test whether a coin is perfect, it is tossed 5 times. The null hypothesis of perfectness of the coin is accepted if and only if atmost 3 heads are obtained. Then the power of the test corresponding to the alternative hypothesis that probability of head is 0-4, is 272 () 3125 2853 3125 56 (iii) 3125 (ii) (iv) none of these.

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