Chapter 7: Random Variables
Use the following to answer questions 1-2: A psychologist studied the number of puzzles subjects were able to solve in a five-minute period while listening to soothing music. Let X be the number of puzzles completed succes
Chapter 10: Introduction to Inference
1. A 95% confidence interval for the mean of a population is computed from a random sample and found to be 9 3. We may conclude A) that there is a 95% probability that is between 6 and 12. B) that there is a 9
Chapter 2: The Normal Distributions
Use the following to answer questions 1-3:
1. For this density curve, which of the following is true? A) It is symmetric. C) The median is 1. B) The total area under the curve is 1. D) All of the above. Ans: D Sec
Chapter 6: Probability: The Study of Randomness
1. I toss a penny and observe whether it lands heads up or tails up. Suppose the penny is fair, that is, the probability of heads is and the probability of tails is . This means A) that every occurrenc
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A Type of Spam Adult Financial Health Leisure Products Scam Other
B Percent 14.5 16.2 7.3 7.8 21.0 14.2 19.0
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E
F
G
H
Distribution of Spam on the Internet
Adult 15%
Oth
A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
B
C
D
E
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Percent of People Aged 25 to 34
Education Count (Millions) Percent Less than high school 4.6 11.8 High school graduate 11.6 30.6 Some college 7.4 19.5 Associate degr
Stat 155.8 Midterm 1 Wednesday, February 16, 2005
Name (please print):
INSTRUCTIONS: 1. Answer all questions and show all work on the exam in the space provided. Please be free to use the back pages if necessary. You will not receive credit if you
Chapter 9: Sampling Distributions
1. A phone-in poll conducted by a newspaper reported that 73% of those who called in liked business tycoon Donald Trump. The number 73% is a A) statistic. B) sample. C) parameter. D) population. Ans: A Section: 9.1 S
Chapter 8: The Binomial and Geometric Distributions
1. An airplane has a front and a rear door that are both opened to allow passengers to exit when the plane lands. The plane has 100 passengers seated. The number of passengers exiting through the fr
1. a) explanatory var. treatment type response var. survival time after surgery b) Individuals are observed without any imposition of some treatment. c) No. An observational study is a poor way to gauge the effect of an intervention. On the other h
Stat 155.8 Midterm 1 Wednesday, February 16, 2005
Name (please print):
INSTRUCTIONS: 1. Answer all questions and show all work on the exam in the space provided. Please be free to use the back pages if necessary. You will not receive credit if you
1. From a large sample, one finds the 95% confidence interval for to be (60.92, 89.78). a) Based on this information, determine the 90% confidence interval for .
60.92 89.78 75.35 moe 75.35 60.92 14.43 1.96 * SEx (z* is used, 2 SEx 7.3622 because n
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Student PIN 1 2 3 4 5
Name Major Advani, Sura Comm Barton, David Hist Brown, Annette Biol Chiu, Sun Psyc Cortez, Maria Psyc
Points 397 323 446 405 461 406.4
Grade B C A B A
Quality Points 3.0 2.0 4.0 3.0 4.0 3.2