when do we use two sample t test
Student's t-test Two-sample t-tests for a difference in mean involve independent samples or unpaired samples. Paired t-tests are a form of blocking, and have greater power than unpaired tests when the paired units are similar with respect to "noise factors" that are independent of membership in the two groups being compared.[12] In a different context, paired t-tests can be used to reduce the effects of confounding factors in an observational study.
Coefficient of determination It is a statistic used in the context of statistical models whose main purpose is either the prediction of future outcomes or the testing of hypotheses, on the basis of other related information. It provides a measure of how well observed outcomes are replicated by the model, based on the proportion of total variation of outcomes explained by the model.[2][3][4]
Aubrey Woods Aubrey Harold Woods (9 April 1928 â€“ 7 May 2013)[1][2] was a British actor and singer.
Is It Fall Yet? The film chronicles the characters' summer break between seasons four and five.