Review_Exam2 - Exam 2 Review 1. Decide whether...

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Exam 2 Review 1. Decide whether distributions 1 and 2 are probability distributions and answer them in sequence. Distribution 1 Distribution 2 x 7 6 5 4 x 3 2 8 9 P(x) -1 1/4 2/4 1/4 P(x) .5 .4 .1 .2 a. Yes, Yes b. Yes, No c. No, No d. No, Yes 2. During the economic slowdown and financial debacle of 2007 & 2008 many people adjusted their contributions to retirement accounts. The data as of September 2008 are presented in the following table: Years of Age <=30 30 – 45 > 45 Total Retirement Contributor 44 41 43 128 No Contribution 32 34 23 89 Total 76 75 67 If a person is selected at random what is the probability that the person is not a contributor? a. .26 b. .41 c. .59 d. .74 3. Referring to the data in Question # 2 above. If a person is selected at random, what is the probability that the person is a contributor OR >45 years of age? a. .49 b. .59 c. .70 d. .51 1
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4. Referring to the data in Question #2 above. Choosing a person at random, what is the probability that the person was not a contributor AND was <= 30? a. .25 b. .15 c. .46 d. .66 5. Referring to the data in Question #2 above. Given that person is <=30, what is the probability that the person is a contributor? a. .20 b. .58 c. .34 d. .48 6. Many students now belong to Face Book and also buy items online. A sample of UNT students was taken to study this relationship. Of the sample, 70% belonged to Face Book and 80% made online purchases. Of those belonging to Face Book;
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This note was uploaded on 04/15/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.

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Review_Exam2 - Exam 2 Review 1. Decide whether...

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