Quiz #5 with Solutions - Basic Statistics I | MATH 1020, Quizzes of Statistics

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iit t J ENE set tet rere ‘ “2 y Berit LE Ueie 2S (25 psiats) (4-Peints-perPart) i ; Name. j a - er call ‘KAccording to the Justice Department, 70% of all crimes are committed by males tam ees 15 to 34. ‘Suppose that you are a sociologist in Rock Springs, Wyoming, and a randam samplé of police files showed.that of 32 arrests last year, 24 were done by males aged 15 to 34 years-Use a 1% level of significande-to test the claim that the population proportion of such arreststn Rock Springs is different from 70%. a. Find Hg ~ b. Find Ha c, Compute the test statistic... d, Find the P-value. a UL a _ecState the conclusion. 2. A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for B, how many medical files should you include ina random sample in order to be 85% sure that the point estimate for p will be within a distance of 0.05 from p?_ZOX (43. pts) lg pts) Vr a /