<P> In 1925 , Ronald Fisher advanced the idea of statistical hypothesis testing , which he called `` tests of significance '' , in his publication Statistical Methods for Research Workers . Fisher suggested a probability of one in twenty ( 0.05 ) as a convenient cutoff level to reject the null hypothesis . In a 1933 paper , Jerzy Neyman and Egon Pearson called this cutoff the significance level , which they named α . They recommended that α be set ahead of time , prior to any data collection . </P>
<P> In 1925 , Ronald Fisher advanced the idea of statistical hypothesis testing , which he called `` tests of significance '' , in his publication Statistical Methods for Research Workers . Fisher suggested a probability of one in twenty ( 0.05 ) as a convenient cutoff level to reject the null hypothesis . In a 1933 paper , Jerzy Neyman and Egon Pearson called this cutoff the significance level , which they named α . They recommended that α be set ahead of time , prior to any data collection . </P>
what is meant by 0.05 level of significance
what is meant by 0.05 level of significance
as a convenient cutoff level to reject the null hypothesis
as a convenient cutoff level to reject the null hypothesis