KP390 Lecture Notes - Lecture 14: Statistical Hypothesis Testing, Standard Deviation, Quadriceps Femoris Muscle
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D and sd = mean and standard deviation of di erences. With 8 df, t0. 05 = +/- 2. 306. Conclude that the mean number of symptoms after therapy was signi cantly less than mean number before therapy. Change may just be a function of time. Data on average quiz performance and midterm, as a percent. Blow is data for 9 students average performance on quizzes and midterms a a percent. Related sample t-test: state the hypothesis. Ho : u quiz = u midterm. Hi: xbar quiz does not equal xbar midterm (non-directional / 2-tailed) Important to use labels rather then 1 and 2 os you properly indicate direction for 1-tailed hypothesis: set alpha level, select the appropriate statistical test. Now this is really calculate the unknowns . Depending on the formula you would like to use, you will need di erent information. 10 children with asthma randomly selected from elementary school in waterloo.
