Question

blood disease that is extremely severe It is particularly common in 11. (4 points) Sickle-cell anemia is a hereditary chronic bl when an individual carries two copies of the defective gene countries plagued by malaria, a parasitic infection transmitt tested 543 children for the sickle-cell gene and also for malaria. 136 children with the sickle-cell gene, 36 children had severe n consisted of 407 children without the sickle-cell gene, infections. A 99% confidence interval for p-p , the difference in propo infections in children with and without the sickle-cell gene, is found to be What is the appropriate conclusion? by mosquitoes. A study in Africa In Group 1 which consisted of malaria infections. Group 2 and 152 of them had severe malaria 39 85 A. There is sufficient evidence that the proportion of severe malaria infections s children with the sickle-cell trait. B. There is not sufficient evidence that the proportion of severe malaria intections among children with the sickle-cell trait is different from that among children without. C. There is sufficient evidence that the proportion of severe children with the sickle-cell trait. malaria infections is higher among D. There is sufficient evidence that the difference in means of severe malaria infections among children with the sickle-cell trait is significantly different from that in children without. E. This question cannot be answered based on a confidence interval. 12. (4 points) A professor performed a test of significance for a claim about the percentages of freshmen, sophomores, juniors, seniors, and graduates (i.e., 5 categories) at his university. Unfortunately, after he finished the test, his computer crashed and consequently he lost all his data except for some numbers he had scrawled on a piece of scratch paper. All he could recall was that one of those numbers was the Chi-square test statistic, and that he rejected the null hypothesis at 5% level of significance. Help the professor identify which of the following could be possible values for the test statistic (hint: there is only one correct answer). A. 9.234 B. 5.211 C. 6.739 D. 9.538 E. Can't tell without seeing the data

Answer 1

11 ) Since , the 99% confidence interval for the difference in propertion is , ( -0.2243 , 0.0068 )

Hypothesis : $H_0:P_1-P_2=0$    VS   $H_a:P_1-P_2\neq 0$

Here , the value of the $P_1-P_2=0$ lies in the 99% confidence interval

Therefore , fail to reject Ho

Hence , There is not sufficient evidence that the propertion of severe malaria infections among children with the sickle-cell trait is different from that among children without.