HSS 2381 Chapter Notes - Chapter 6: Visual Analogue Scale, Pooled Variance, Null Hypothesis
10 Dec 2016
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Two-sample t-tests: two-sample t-tests are used when the independent variable is a nominal-level variable with two levels when two categorical groups are being compared. Children with versus without cystic fibrosis: examples, examples, two-sample t-tests are used when the dependent variable is an interval- or ratio- level variable a variable for which you can compute a mean. Fatigue (measured on a 100-point visual analog scale) Null hypotheses for t-tests: the null hypothesis is that the two group means are the same, the independent variable and dependent variable are not related. Alternative hypotheses for t-tests: the alternative (research) hypothesis is that the two group means are different the independent variable and dependent variable are related, nondirectional doesn"t state whether 1 is greater than 2 vice versa (two tailed). H1: 1 2 there is a difference. 1 = the mean for group 1 and 2 = the mean for group 2. Note: this is about population parameters ( ), not statistics (x )
