All are true about P-value except

A. Is the probability of committing Type-I error

B. When P-value is less than a, the result is statistically significant

C. Is the chance that the presence of difference is concluded when actually there is none

D. Is equal to 1-b

Correct Answer: Is equal to 1-b

Description: • ‘Type I error is usually fixed in advance’ by the choice of level of significance employed in the test • Type I error is more serious than Type II error • Power of a test: 1 – b – Is probability of rejecting a Null hypothesis when a predetermined clinically significant difference is indeed present – Power can be increased by increasing the no. of subjects in a trial

Category: Social & Preventive Medicine

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