T or F When I decide to retain or reject the null hypothesis

T or F

When I decide to retain or reject the null hypothesis, I can never be certain that I’ve made the correct decision

Solution

True.

The hypothesis conclusion will be as

There is/is no statistical evidence to claim the null hypothesis is true at 5% significance level or 1% significance level etc.

Hence we can minimise the error of type I by suitable alpha but cannot be certain to state that conclusion is 100% right.