Practice Final Exam - Introduction to Statistics | MATH 4600, Exams of Statistics

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STAT 301-003 STAT 301-003, Practice Exam 2 Practice Exam 2 Practice Exam 2 b. Find 4 95% confidence interval for the ruc mean vehicle speed at the curve. Interpret the interval. 4, A.cerain curve on the highway lias many accidents. Authorities bolieve this occurs because drivers routinely exceed safe spocds. Suppose the safe speed limit is 45 mph. “The police set up a radar gun that records the speeds of pessing vehicles, They obtain a sample of 207 vehicles and find that the mean speed was 49 mph. Its known that the ‘rue standard deviation of spoods atthe curve is 7 mpi. a, Test the authorities claim at the 0.05 level Step 1 In tems of the problem, what is tho Type I orror? Step 4, In forms of the problem, what isthe Type II erat? ‘Step 3 (Continue with the est of the hypothesis jest even ifthe assumptions do pot ho Step 4 & Suppose you wish to find a 95% confidence interval that is no wider than 4 units long. How many vehicles must you sample? Step 5 2, Suppose itis known that the average CSU student spends $532 on textbooks each Semester, with a standard deviation of $12. Step 6 ‘8, What is the probability that if you asked 45 students, thelr average texthook cost ‘would be more than $580? Step 7 bb, What is the probebility that if you asked 45 students, their average texthook cost ‘would be less than $5007