By D. J., Chambers, Joan Sybil Crawshaw

ISBN-10: 074875475X

ISBN-13: 9780748754755

This name is totally revised and up to date for whole insurance of records at complex point. using a moment colour highlights key parts and formulation. Summaries are integrated to supply consolidation of studying and figuring out. extra perform sections of questions are provided for thorough examination guidance and perform. New ICT aid for this key zone is equipped all through.

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Additional info for A Concise Course in Advanced Level Statistics: With Worked Examples, Fourth Edition

Example text

What is the chance of demonstrating a difference if there is one. 101. 101, our statistical analysis would not be able to reject the null hypothes is of no difference, when larger, it would rightly be able to reject the null hypothesis of no difference. So, in fact 100-70=30% of the many trials would erroneously be unable to reject the null hypothesis of no difference, even when a true difference is in the data. 7 (70%), otherwise called the chance of finding a difference when there is one ( area under curve (1-f3)x 100%).

Paired comparison using Mann -Whitney test: placebo-controlled clinical trial to test efficacy ofsleeping drug Hours of sleep rank Patient drug placebo difference (ignoring sign) \ 2 3. 4. 5. 6. 7. 8. 9. \0 . 5 for both of them. 36 CHAPTER 2 The Mann-Whitney test uses the signs and the relative magnitudes of the data instead of the actual data (table 10). We have 3 steps : 1. 5); 2. 5 3. The null hypothesis is that there is no difference between += andranknumbers. We assess the smaller of the two ranknumbers.

Wissenschaftliche Tabelle, Documenta Geigy, Basel, 1995) and numerous statistical software packages can readily provide you with the CIs. Table I. The prevalence ofside-effects after 8 week treatment Alpha blocker n=16 side effect nasal congestion alcohol intolerance urine incontinence disturbed ejaculation disturbed potence dry mouth tiredness palpitations dizziness at rest dizziness with exercise orthostatic dizziness sleepiness yes 10 2 5 4 4 8 9 5 4 8 8 5 no 95% CIs(%) 6 35-85 12 2-43 11 11-59 2 22-96 2 22-96 8 25-75 7 30-80 11 11-59 12 7-52 8 25-75 8 25-75 10 12-62 alpha plus beta blocker n=15 yes no 10 5 2 13 5 10 2 2 2 2 11 4 11 4 2 13 5 10 12 3 10 5 9 6 95% CIs (%) 38-88 4-71 12-62 7-93 7-93 45-92 45-92 2-40 12-62 52-96 38-88 32-84 Table 1 gives an example.

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A Concise Course in Advanced Level Statistics: With Worked Examples, Fourth Edition by D. J., Chambers, Joan Sybil Crawshaw

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