Eighteen middleaged women with platelet readings between 120,000 platelets per microliter and 150,000 platelets per microliter of blood were selected randomly from the population of similar female patients at a large local hospital. Nine of the 18 women were assigned randomly to group A and received a placebo. The other nine women were assigned to group B and received a new platelet drug. After four months, posttreatment platelet readings were taken for all 18 women and were compared with pretreatment readings. The reduction in platelet level (Pretreatment reading ? Posttreatment reading) for each woman in the study is shown here. Group A (placebo) increase (in platelets per microliter): 2,000, 5,000, 7,050, 10,125, 12,345, 17,350, 13,250, 12,200, 9,125 Group B (platelet drug) increase (platelets per microliter): 28,450, 23,438, 36,380, 12,450, 16,100, 21,350, 39,400, 41,000, 14,325 Part A: Do the data provide convincing evidence, at the ? = 0.05 level, that the platelet drug is effective in producing a reduction in mean platelet level? Part B: Create and interpret a 95% confidence interval for the difference in the placebo and the new drug. Answer: (1 Likes and 0 dislikes) Part (A) : H0: The platelet drug is not effective in producing a reduction in mean platelet level H1: The platelet drug is effective in producing a reduction in mean platelet level Let the 105 be alpha = 5% Dlltl'ip'll statistics: Group A, Group 3 Intel Viriablc Count Bean Stcv Virilnce Group A 5 5527 4652 21642333 GEDIQB '9' ESB'F'J' 10979 120534101 Test autistic I: d = 253-\" =7.071 31' n 10929! 9 t critical value = 1.859 Here t value > t critical value so we reject H0 thus we conlcude that The platelet drug is effective in producing a reduction in mean platelet level