What is the role of significance level in testing null hypotheses?
A4 A significance level is a cutoff needed for each statistical test to render a conclusion as to whether there is a “significant” (not necessary true) difference between the groups.A critical value is selected so that the chances of committing a type I error is minimized.Traditionally a critical value for the significance level (alpha) is set at alpha = 0.05 or 0.01 for a risk of type I error of 5% or 1% respectively.
