STAT
Midterm 1A practice

# Ans 37 suppose each unit sold results in a profit of

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ANS__________________ 37. Suppose each unit sold results in a profit of \$100. How much profit are you expected to earn per contact ? ANS__________________ 38. The output below gives summary statistics for a dataset of 100 people. The variable “Years” measures years of education and “Salary” measures the person’s annual salary. Suppose you want to predict someone’s salary given the number of years of education they have. What is the slope of the regression line? Include units. Variable Mean StDev Salary 58293.51 22106.96 Years 9.264 2.792 Pearson Correlation: 0.805 ANS_________________ 39. Trying to make predictions for Y using values of X outside the range of where data is collected is called ____________________. (ONE WORD statistical answer only.) 8

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40. Match the histograms to their statistics by filling in the last row of the table below. Data Set A Data Set B Data Set C Data Set D Mean 5.5 1 6 5.5 Standard Dev 3.03 0 1.05 4.74 Corresponding Histogram 9
ANSWER SHEET MC AND TF NAME_____________________________ Stat 133 Midterm 1 AU 2009 RECITATION TIME ________________ 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 22. A B C D 23. A B C D 24. A B C D 25. A B C D 26. A B C D 27. A B C D 28. A B C D 29. A B C D 30. A B C D 10
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