A study finds no significant association between two variables but truly there exists a difference. What type of error is this?
(A) Type I error (B) Type II error (C) Random error (D) Systematic error
(B) Ans: B. Type II error(Ref: High Yield Biostatistics/p46)Type I ErrorType II ErrorThe null hypothesis is true but rejected (False positive)degProbability of type I error is given by p valuedegSignificance (alpha) level is the maximum tolerable probability of type I errorsdegKeep type I error to be minimum; then results are declared to be statistically significantNull hypothesis is not false but is not rejected/accepted (false negative)degProbability of type II error is given by betadeg