How can 95 confidence intervals helps us estimate the effec

How can 95 % confidence intervals helps us estimate the effect size of an experimental manipulation?

Solution

How can 95 % confidence intervals helps us estimate the effect size of an experimental manipulation?

From 95 % confidence intervals we are able to find is there any significant result. When our finding is statistically significant all we know is that our result would be unlikely if the null hypothesis were true and that you therefore have decided to reject your null hypothesis and to go with our alternative hypothesis. But this does not tell you anything about how big of an effect is present or how important the effect would be for practical purposes. When we determine that a finding is statistically significant we must use the effect size indicators to find how strong the relationship.