18 true or false the sample size required to detect

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18. True or False? The sample size required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.50 with 80% power and a 5% level of significance. Essay 10. A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below. Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not. 13. The table below summarizes baseline characteristics of patients participating in a clinical trial. a) Are there any statistically significant differences in baseline characteristics between treatment groups? Justify your answer. B and C are BONUS-OPTIONAL B) Write the hypotheses and the test statistic used to compare ages between groups. (No calculations – just H 0 , H 1 and form of the test statistic). C) Write the hypotheses and the test statistic used to compare % females between groups. (No calculations – just H 0 , H 1 and form of the test statistic). d) Write the hypotheses and the test statistic used to compare % females between groups. (No calculations – just H 0 , H 1 and form of the test statistic.)
14. A study is designed to investigate whether there is a difference in response to various treatments in patients with Rheumatoid arthritis. The outcome is the patient’s self-reported effect of treatment. The data are shown below. Is there a significant difference in effect of treatment? Run the test at a 5% level of significance. 17. The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the difference in mean total cholesterol levels between treatments.

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