UT Knoxville STAT 201  Practice Exam 1  SP14 (13 pages)
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Practice Exam 1  SP14
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 Pages:
 13
 School:
 University of Tennessee
 Course:
 Stat 201  Introduction to Statistics
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Statistics 201 Exam 1 from Fall 2013 Practice Exam 1 for Spring 2014 This practice exam is provided solely for the purpose of familiarizing you with the format and style of the Stat 201 exams There is no explicit or implicit guarantee that the upcoming exam will ask similar questions If you use the practice exam as your only tool to help you prepare for the upcoming exam you most likely will not do well on the exam You should still do the things you would have done if you did not have access to this practice exam such as re read the text go over your class notes re work the online homework problems and look at the list of exam topics provided and make sure that you understand all the concepts listed within it 1 1 A study at a medical center examined 129 people to see if contracting hepatitis C was associated with having diabetes Researchers used medical records to determine whether or not the subject has diabetes and or hepatitis C Report your answers to TWO decimal places HAS hepatitis C Does NOT have hepatitis C Total HAS diabetes 21 39 Does NOT have diabetes 12 57 Total 60 69 129 33 96 i 3 points What percent of the subjects do not have hepatitis C ii 3 points What percent of the subjects who have diabetes do not have hepatitis C iii 3 points What percent of the subjects with hepatitis C do not have diabetes iv 4 points Do you think there is an association between hepatitis C virus and diabetes Circle your answer YES NO Using the mosaic plot below briefly explain your answer in the space to the right of the plot 2 2 5 points The response times of a particular web server are approximately normally distributed with a mean of 120 milliseconds and a standard deviation of 15 milliseconds Given that any value from a normal distribution with a z score of 0 841 represents the 20th percentile use this fact to calculate the 80th percentile for these response times 3 5 points Suppose that the wait time to reach a technical support person at a large software company is
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