STAT
Practice Final Exam AU10

# Descriptive statistics time cost variable n mean se

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Descriptive Statistics: Time, Cost Variable N Mean SE Mean StDev Variance Time 52 10.865 0.369 2.664 7.099 Cost 52 1041.9 35.9 258.9 67043.1 Pearson’s Correlation: 0.7375 ANS_________________ 30. Let X = price of stocks in Bob’s portfolio; Mean of X = \$20, SD = \$5. After 6 months, suppose the price of all the stocks in Bob’s portfolio went down by 50%. a. What is the new mean of Bob’s stocks? b. What is the new SD of Bob’s stocks? 31. Suppose Bob estimated the average exam score for his large class by taking a random sample of 50 students. The margin of error for Bob’s 95% confidence interval was plus or minus 3 points. The mean of his sample was 82. What was the standard deviation of the population of exam scores assumed to be? ANS________________ 12

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ANSWER SHEET MC AND TF      NAME_____________________________ RECITATION TIME________________     GROUP NUMBER__________________ 1. A B C D 2. A B C D 3. A B C D 4. A B C D 5. A B C D 6. A B C D 7. A B C D ________________________________ 8. A B C D 9. A B C D 10. A B C D 11. A B C D 12. A B C D 13. A B C D 14. A B C D _______________________________ 15. A B C D 16. A B C D 17. A B C D 18. A B C D 19. A B C D 20. A B C D 21. A B C D 13
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