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If we use upper-case letters to indicate results significant at the 0.05 level and lower-case to indicate results significant at the 0.001 level we get: a>b, A’D, a>f, a>g, c>d and c>f. (Often commercial studies use upper-case for significant at the 0.05 level and lower case for significant at the 0.10 level.)
If we use upper-case letters to indicate results significant at the 0.05 level and lower-case to indicate results significant at the 0.001 level we get: a>b, A’D, a>f, a>g, c>d and c>f. (Often commercial studies use upper-case for significant at the 0.05 level and lower case for significant at the 0.10 level.)
Usually, statistical significance is determined by calculating the probability of error (p value) by the t ratio. The difference between two groups (such as an experiment vs. control group) is judged to be statistically significant when p = 0.05 or less.
0:27 2:37 Suggested clip Grafted Prism — Showing significant differences on graphs (v8 YouTubeStart of suggested client of suggested clip Grafted Prism — Showing significant differences on graphs (v8
A hypothesis test or test of statistical significance typically has a level of significance attached to it. This level of significance is a number that is typically denoted with the Greek letter alpha.
The significance level, also denoted as alpha or, is the probability of rejecting the null hypothesis when it is true. For example, a significance level of 0.05 indicates a 5% risk of concluding that a difference exists when there is no actual difference.
Statistical significance is most practically used in statistical hypothesis testing. For example, you want to know whether changing the color of a button on your website from red to green will result in more people clicking on it. P-value refers to the probability value of observing an effect from a sample.
Why is an alpha level of. 05 commonly used? Seeing as the alpha level is the probability of making a Type I error, it seems to make sense that we make this area as tiny as possible. The smaller the alpha level, the smaller the area where you would reject the null hypothesis.

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