1.Data are 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 in table 7-6. 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.

Percent Wound Healing

Teatment0-25%26-50%31-75%76-100%

New Compund

(N=125)14373241

Placebo

(n=125)36453410

2.Use the data in problem 1 and pool the data across the treatments into one sample of the size n= 250. Use the pooled data to test whether the distribution of the percent wound healing is approximately normal. Specifically, use the following distribution: 30%, 40%, 20%, and 10%. Run the appropriate test at =0.05

3.The data in table 7-7 are collected in an experiment designed to investigate the impact of different positions of the mother during the ultrasound on fetal heart rate, fetal heart rate is measured by ultrasound in beats per minutes. The study includes 20 women who are each assigned to one position and have the fetal heart rate measured in that position. Each woman is between 28 weeks and 32 weeks gestation. Is there a significant difference in mean fetal heart rates by position? Run the test a 5% level of significant.

BackSideSittingPain

140141144147

144143145145

146145147146

141144148149

139136144145

4.A clinician 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 outcomes is pain relief within 30 minutes. The data are shown table 7-8. Is there a significant difference in the proportion of patients reporting pain relief? Run the test at 5% level of significance.

Pain ReliefNo Pain Relief

New Medication4476

Placebo2196