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Practice Exam 3

# Practice Exam 3 - Math 403 Practice Exam 3 Covering...

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Math 403 Practice Exam 3 Covering chapters 5 and 6.1-6.4 1. To determine their length, 10 western rattlesnakes are selected. Their lengths in inches are: 40.2 43.1 45.5 44.5 39.5 40.2 41.0 41.6 43.1 44.9 a. Is it likely that the true average length of a western rattlesnake is 44 inches? Use a 95% confidence interval. (42.36+/- 2.262(2.158/sqrt(10)) or (40.82, 43.90), no 44 inches is not likely ) 2. The yield of a chemical process is being studied. The past 5 days have resulted in the following yields: 91.6, 88.75, 90.8, 89.95, and 91.3. Assume that the population is normal and test to determine if the population mean is significantly greater than 89. Use α =.05. (t=2.874, .025>p-value>.01, reject …there is evidence…) 3. The breaking strength of yarn used in manufacturing drapery material is required to be at least 100 psi. Past experience has indicated that the standard deviation of breaking strength is 2 psi. A random sample of nine specimens is tested, and the average breaking strength is found to be 98 psi. Should the fiber be judged acceptable with α =0.05? Assume a normal population.

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(z=-3, p=.0013, reject Ho) 4.
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