UT Knoxville STAT 201 - Practice Exam 1 (KEY) - SP14 (13 pages)

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Practice Exam 1 (KEY) - SP14



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Practice Exam 1 (KEY) - SP14

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Pages:
13
School:
University of Tennessee
Course:
Stat 201 - Introduction to Statistics
Introduction to Statistics Documents

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Statistics 201 Exam 1 from Fall 2013 Practice Exam 1 for Spring 2014 KEY 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 i HAS diabetes 21 39 Does NOT have diabetes 12 57 Total 60 69 129 33 96 3 points What percent of the subjects do not have hepatitis C 96 129 7442 74 42 3 points What percent of the subjects who have diabetes do not have hepatitis C 39 60 6500 65 00 ii 3 points What percent of the subjects with hepatitis C do not have diabetes 12 33 3636 36 36 iii 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 Seems that subjects with diabetes were more likely to have Hepatitis C The heights of the bars are not equal 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



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