HSS 2381 Chapter Notes - Chapter 6: Visual Analogue Scale, Null Hypothesis, Sampling Distribution

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 2381
• Professor: Eleanor Riesen

Document Summary

Two-sample t-tests are used when the independent variable is a nominal-level variable with two levels that is, when two groups are being compared. Two-sample t-tests are used when the dependent variable is an interval- or ratio-level variable that is, a variable for which it is appropriate to compute a mean. Fatigue (measured on a 100-point visual analog scale) The null hypothesis is that the two group means are the same i. e. , that the independent variable and dependent variable are not related. The alternative (research) hypothesis is that the two group means are different that is, that the independent variable and dependent variable are related. 1 = the mean for group 1 and. 2 = the mean for group 2. In a two-sample t-test, testing the null hypothesis involves computing a test statistic and (cid:272)o(cid:373)pari(cid:374)g it to (cid:448)alues of (cid:449)hat is (cid:862)i(cid:373)pro(cid:271)a(cid:271)le,(cid:863) if the (cid:374)ull h(cid:455)pothesis (cid:449)ere true.