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Written Assignment 4 - Gabriel A. Godart

# Written Assignment 4 - Gabriel A. Godart - Principles of...

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Principles of Statistics 2010-04-STA-201-009OL Written Assignment 4 Gabriel A. Godart Thomas Edison State College. Exercises Set 6.1 Exercise 6.4 If µ = 1 and σ = 2 then µ - 3σ = -5 and µ + 3σ = 7 If µ = 2 and σ = 1 then µ - 3σ = -1 and µ + 3σ = 5 The normal distribution with mean 1 and standard deviation 2 has a wider spread. Exercise 6.6 a. False. Both normal distributions have a different standard deviation σ. b. True. The mean affects where the curve is centered and both normal distributions have the same mean µ. Exercise 6.14 a. 7.83% female students are shorter than 61 inches. b. 100(0.0009+0.0018+0.0080+0.0227+0.0450) = 7.84 7.84% female students are shorter than 61 inches. c. Both answers coincide. The area under the standard normal curve with parameters µ=64.4 and σ=2.4 that lies to the left of 61 is equal to the sum of the relative frequencies under 61 inches.

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Exercise 6.20 a. b. Yes, it appears to have roughly a bell shaped distribution and be normally distributed. Exercises Set 6.2 Exercise 6.28 With the standardized normally distributed variable z.
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Written Assignment 4 - Gabriel A. Godart - Principles of...

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