Samfinal - STA 2023 Sample FINAL EXAM Name: INSTRUCTIONS 1....

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Unformatted text preview: STA 2023 Sample FINAL EXAM Name: INSTRUCTIONS 1. Fill in all the spaces above with the required information. 2. Make sure your exam includes 9 problems, a formula sheet, a z-table and a t-table. The student is responsible for making sure the exam is nondefective. 3. This exam is worth a total of 140 points. The point value of each question is indicated in parentheses. 4. For questions that are true or false, circle your selection. For questions that are to be worked out, show your work in the space provided . No partial credit can be given unless you show your work. Full credit will be given only if the correct reasoning is included. 5. If a problem says SET UP , you dont need to implement the arithmetic necessary to reach the final numerical answer. You should work the problem completely up to the point of doing the arithmetic. Put all numbers into the appropriate formula(s), leaving no symbols or letters. 6. Do not spend too much time on any part of the exam. Skip questions that cause you trouble and return to them later. 7. When turning in the exam, show your picture i.d. STA 2023 INTRO TO STAT I Sample FINAL EXAM 1 1. According to a recent report in The Gainesville Sun (12/1/97), a survey was done of persons of ages 65 or older. Of the 382 persons interviewed, 225 indicated that drivers who are 65 years of age or older should be required to take a test for vision and reflexes every year in order to renew their drivers licenses. Is there sufficient evidence to indicate that more than half of those 65 years of age or older think that persons in that age-group should be tested for vision and reflexes each year in order to renew their drivers licences? (a) Give the appropriate null and alternative hypotheses that will permit us to answer the question posed above. Define any parameter(s) that you use. (6 pts) (b) What is the appropriate rejection region if we use = . 02? (4 pts) (c) SET UP the calculations for the value of the appropriate test statistic. (8 pts) (d) If the calculated value of the test statistic from part (c) is 3 . 51, what is the appropriate conclusion, in terms of this application. (4 pts) STA 2023 INTRO TO STAT I Sample FINAL EXAM 2 2. Credit card debt is a real problem for college students. Many students have multiple credit cards and have charged the limit on each card they have! According to national figures, 20% of all college students possess 4 or more credit cards. We are interested in conducting a survey to estimate the proportion of students in the state of Flordia who possess 4 or more cards. If we wish to estimate this proportion accurate to within 2% with 95% confidence, how many students do we need to include in our survey? SHOW YOUR WORK!...
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Samfinal - STA 2023 Sample FINAL EXAM Name: INSTRUCTIONS 1....

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