WA5 - Robert E Goode Thomas Edison State College...

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Robert E Goode Thomas Edison State College STA-201-OL010 Mentor: Steve Stutz Date: 10/08/11 Writing Assignment #5 Exercise 7.1 (7.12) b. Sample Wealth Mean G,B,A,P 41,31,26,20 29.5 G,B,A,T 41,31,26,18 29 G,B,A,E 41,31,26,17 28.75 G,B,P,T 41,31,20,18 27.5 G,B,P,E 41,31,20,17 27.25 G,B,T,E 41,31,18,17 26.75 G,A,P,T 41,26,20,18 26.25 G,A,T,E 41,26,18,17 25.5 G,P,T,E 41,20,18,17 24 B,A,P,T 31,26,20,18 23.75 B,A,T,E 31,26,18,17 23 A,P,T,E 26,20,18,17 20.25 B,P,T,E 31,20,18,17 21.5 B,A,P,E 31,26,20,17 23.5
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C. D. P(mean) = 25.5 = 1/15 = .06 E. P(25.5-2<X<25.5 +2) = P(23.5<X<27.5) = 27.5 27.25 26.75 26.25 25.5 24 23.75 =7/20 = .35 Exercise 7.2 (7.18,7.20,7.22,7.30,7.32) 7.18 We often can approximate a sampling distribution by a normal distribution; the variable x is approximately normally distributed
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7.20 No, for any particular sample size, the mean of all possible sample means equals the population mean regardless of the size of the sample. 7.22 Increasing the sample size leads to a smaller sampling error because possible sample means cluster more closely around the mean as the sample size increases while effectively lowering the sampling error. 7.30 a. population: self-employed persons with home-based businesses the variable is the number of hours of business work performed at home b.
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