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Written Assignment 6 - Gabriel A. Godart

# Written Assignment 6 - Gabriel A. Godart - Principles of...

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Principles of Statistics 2010-04-STA-201-009OL Written Assignment 6 Gabriel A. Godart Thomas Edison State College. Exercises Set 8.1 Exercise 8.4 a. b. Since some sampling error is expected, it is unlikely that the sample mean will exactly equal the population mean. Exercise 8.6 σ = 2.4 a. The confidence interval will be 6.87 to 8.31 young per liter. b. We can be 95.44% confident that the interval from 6.87 to 8.31 young per liter contains µ.

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c. Because it depends on the sample mean, which in turn depends on the sample selected. Exercise 8.8 n = 45 and a. This is the point estimate because it consists of a single value. b. The confidence interval is \$2483.15 to \$3287.91 c. If a histogram looked bell shaped or if a normal probability plot produced a relatively straight line. d. No, because the sample size 45 is large enough. Exercises Set 8.2 Exercise 8.24 A Good typist can input 70 words / minute. Confidence level = 1-0.99 = 0.01 We can conclude that most applicants’ typing skills are below those of a good typist.
Exercise 8.26 =25, n = 36, σ = 3 and the confidence level is 95% The 95% confidence interval for µ is to to 24.02 to 25.98 Exercise 8.32 =947.38, n = 18, σ = 188 and the confidence level is 95% The 95% confidence interval for µ is a. to to 860.528 to 1034.23 b. We can be 95% confident that the interval from 860.528 to 1034.23 mg contains the population mean calcium intake µ, with incomes below the poverty level. Exercise 8.38 =947.38, n = 18, σ = 188 and the confidence level is 95% a. α = 1-0.90 = 0.10

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= =1.645 The 90% confidence interval is to 874.487 to 1020.27 b. Because we have decreased the confidence level from 95% to 90%. c.
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Written Assignment 6 - Gabriel A. Godart - Principles of...

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