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STAT303: Secs 102 and 103
Summer I 2000
Exam
Form A
Instructor: Julie Hagen Carroll
- Don’t EVEN open this until you are told to do so.
- Be sure to mark your section number and your test form (A, B, C or D) on the scantron!
- Sign your name where indicated on your scantron and write your section number, seat number and computer number beside it. You will get your scantrons back tomorrow in class. You may keep this exam.
- There are 20 multiple-choice questions on this exam, each worth 5 points. There is partial credit. Please mark your answers clearly on the scantron. Multiple marks will be counted wrong.
- You will have 60 minutes to finish this exam.
- If you are caught cheating or helping someone to cheat on this exam, you both will receive a grade of zero on the exam. You must work alone.
- This exam is worth 100 points, and will constitute 20% of your final grade.
- Good luck!
STAT303: 102 and 103 Exam #2, Form A Summer 2000
- What is the 89th percentile for a standard nor- mal, ı.e., Z ∼ N (0, 1)?
A. 0. B. 0. C. 1. D. 1. E. 1.
- What is z∗^ such that P (−z∗^ < Z < z∗) = 0.80?
A. 0. B. 0. C. 0. D. 1. E. 1.
- What is P (X ≥ 0 .5)?
A. 0. B. 0. C. 0, there is no probability at exact points D. 0. E. 0.
- Probability is
A. the area under the curve B. the likelihood of an event occurring C. a proportion D. all of the above E. exactly two of the above
| Vehicle Hometown| car suv truck | Total --------+------------------------+---------- lcity | 9 1 2 | 12 metro | 20 9 3 | 32 outsid | 2 0 3 | 5 scity | 12 2 2 | 16 town | 13 3 7 | 23 --------+------------------------+---------- Total| 56 15 17 | 88 Pearson chi2(8) = 13.1191 Pr = 0.
- The table above shows the relationship between what students in the class drive and where they live. Do you think the two categories are related? Remember what the χ^2 , chi-squared tells us!
A. The p-value, Pr = 0.108, is greater than 5%, so we can say that the relationship is statistically significant. B. The p-value, Pr = 0.108, is greater than 5%, so we can NOT say that the relation- ship is statistically significant. C. If you live in a metroplex, then you’re most likely to drive a car, so the categories are NOT related. D. The probability of driving a car is about the same whether you know you live in a metroplex or not, so the categories are not related. E. Since the table contains only one 0, the cat- egories must be related.
- From the previous table, how likely are you to drive a truck if you live in a town?
A. 7/ B. 7/ C. 7/ D. 17/ E. 17/
- Again from the table, how likely are you to be from a small city AND drive a truck?
A. 2/ B. 2/ C. 2/ D. 16/ E. 2/17*2/
- And still from the table, are driving an SUV and living in a large city independent events?
A. Yes, there’s only one in either category. B. Yes, it’s the least likely choice in either cat- egory. C. No, 1/ 12 6 = 1/15. D. No, 12/ 88 ∗ 15 / 88 6 = 1/88. E. No, 12/ 88 6 = 15/88.
- For Z ∼ N (0, 1), what is P (Z > − 1 .26)?
A. 0. B. -0. C. 0. D. -0. E. 0.
