Exam (elaborations) MATH 399 Week_7_Quiz_with_answers

1. Thetimespent (in days) waiting fora kidney transplant tor people ages 35-49 can be approximiated by the normal distribution, as shown inthe figure to theright. (a) What waiting time represents the 95th percentile? (b) What waiting time represents the first quartile? Click to viewpage 1 of theStandard Normal Table.3 Click to viewpage 2 of theStandard Normal Table,4 (a) Thewaiting timethatrepresents the 95th percentile is days. (Round to tha nearest intagar as needad.) (b)Thewaiting timethatrepresents the first quartile is days. (Round to tha nearest intagar as needad.) 1: Standard Normal Table (Page 1) hIIps:nc:mg.lXlT1f1pilv1/p"inlfrmdh /i='=207.2 ... x III I I Da,. 411e12016 We87QLiz 2. A researcher wishes to estimate, with 90% confidence, the population proportion of adults who are confident with their country's banking system. His estimate must be accurate within 3% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 36% of the respondents said they are confident with their country's banking system. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n = (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 36% of the respondents said they are confident with their country's banking system? n = (Round up to the nearest whole number as needed.) (c) How do the results from (a) and (b) compare? o A. Having an estimate of the population proportion raises the minimum sample size needed. o B. Having an estimate of the population proportion has no effect on the minimum sample size needed. o C. Having an estimate of the population proportion reduces the minimum sample size needed