STAT 263 Lecture 11: Week 11 - 2
4 Dec 2017
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Cherry picking: where research if favourabel to one"s position is reported, unfavourable research is hidden. Chapter 18 non- parametric tests: only need to know the large sample sign test, n>10, u test (two independent samples) If hypothesized value of the median is correct there should be equal numbers of + and . Use the 1% level of sig. 35 we observe 35 +"s and 14 s. Critical value is z0. 005= 2. 576. Therefore we have evidence at the 1% level of significance to conclude the median is not equal to 32. The true value is higher. Always use parametric test if you can, only do non- parametric test if you cannot do a parametric test. 0. 25(16) z= 1. 75 critical value is z0. 025 = 1. 96. Sign test uses: one sample test about the median. H0: = 0: paired or matched data. Ex. if we compare bean size in two diff locations, the following data is the diameter.
