Test 4 with Solutions | Basic Statistics I | MATH 1020, Exams of Statistics

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VYesr Sit. Reni \U, vaio i U2 breath | Name. _ (4 Points per Part) 1. According to the Justice Department, 70% of all’ crimes are committed by males from the ages of 15 to 34. Suppose that you are a saciologist in Rock Springs, Wyoming, and a random sample 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 significance to test the claim that the population proportion of such arrests in Rock Springs is different from 70%. Se > "7 5 a. Find Hg) = y . Zz: b. Find Ha_¥ SSI @ . c. Compute the test statistic._- Ze 4 d, Find the P-value._~_ PPS3.52% = 5252 a $2 = + . 4 as /-.7324* S362 4 {-.7324 e. State the conclusion, / \ OA 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 p, how many medical files should you include in a random sample in order to be 85% sure that the paint estimate for p will be within a distance of 0.05 from p?. ( 13 pts)