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##### week 3 problems

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Question;Week 3 Problems?30 points;10 points per;problem. Put answers in the table;1.;RD;=.366-.175 =.175;RR=;= = 2.09;OR;== = 2.73;Upper;Limit of CI ? 1.61;Lower;Limit of CI ? 0.41;Based;om the Confidence Interval values which of the following are true?;Answer;D ? One can be 95% confident that the true value will be greater than both;the upper and lower limits;2.;3.;1. A clinical trial is conducted comparing a new pain medication;for arthritis. Participants are randomly;assigned to receive the new medication or a placebo. The outcome is pain relief within 30 minutes. The data are shown below.;Pain Relief;No Pain Relief;New Medication;44;76;Placebo;21;99;Estimate the risk difference in;pain relief between treatments;=;Estimate the relative risk in pain;relief between treatments;=;Estimate the odds ratio in pain;relief between treatments;=;The upper and lower limits of the are shown below;Lower Limit of CI: ____0.41;Upper Limit of CI: ___1.61;Based on the;Confidence Interval values which of the following are true?;A.;One can be;95% confident that the true value will be greater than the upper limit.;B.;One can be;95% confident that the true value will be greater than the lower limit.;C.;One can be;95% confident that the true value will between the upper and lower limit.;D. a and b;2.The following;data were collected in a clinical trial evaluating a new compound designed to;improve wound healing in trauma patients.;The new compound is compared against a placebo. After treatment for 5 days with the new;compound or placebo the extent of wound healing is measured and the data are;shown below.;Percent Wound Healing;Treatment;0-25%;26-50%;51-75%;76-100%;New Compound (n=125);15;37;32;41;Placebo (n=125);36;45;34;10;Is there a difference in the;extent of wound healing by treatment?;(Hint: Are treatment and the percent;wound healing independent?) Run the;appropriate test at a 5% level of significance.;df=;alpha=;Reject H0if?2>;Compute expected frequencies;Expected Frequency = (Row Total * Column;Total)/N.;Complete the expected frequencies;for each cell.;Percent Wound Healing;Total;Treatment;0-25%;26-50%;51-75%;76-100%;New Compound;15;();37;();32;();41;();125;Placebo;36;();45;();34;();10;();125;Total;51;82;66;51;250;Compute?2.;?2=;Based on comparing the computed?2to the;rejection level?2which of the following is (are) true?;A.;We have;statistically significant evidence at alpha=0.05 to show that H0 is;false.;B. Treatment and percent wound healing are not;independent.;C.;Treatment;and percent wound healing are independent.;D.;a and b.;3. A clinical trial is conducted comparing a new pain;reliever for arthritis to a placebo.;Participants are randomly assigned to receive the new treatment or a;placebo and the outcome is pain relief within 30 minutes. The data are shown below.;Pain Relief;No Pain Relief;New Medication;44;76;Placebo;21;99;Is there a significant difference;in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.;Reject;H0 if Z;alpha=;=;=;=;Z =;Based on comparing the computed zto the rejection level zwhich of the following is (are) true?;A.;We have;statistically significant evidence at alpha=0.05 to show that H0 is;false.;B. We have statistically significant evidence at;alpha=0.05 to show thatthere a significant difference in the;proportions of patients reporting pain relief.;C.;We do not;have statistically significant evidence at alpha=0.05 to showthere a;significant difference in the proportions of patients reporting pain relief.;D.;a and b

Paper#60347 | Written in 18-Jul-2015

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