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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.1: Measures Of Center

Problem 9PPS

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Two types of plastic are suitable for an electronics component manufacturer to use. The breaking
strength of this plastic is important. It is known that σ₁ = ₂ = 1.0 psi. From a random sample
size n₁ = 10 and n₂ = 12, you obtain ₁ = 162.5 and ₂ = 155.0. The company will not adopt
plastic 1 unless its mean breaking strength exceeds that of plastic 2 by at least 10 psi.
Based on the sample information, should the company use plastic 1? Use a = 0.05.
a. Reject the Null Hypothesis. Zo = -5.84
b. None among the choices
O c. Fail to reject the Null Hypothesis. P-value > 0.05
d. Fail to reject the Null Hypothesis. Zo < 1.65

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The average wind speed in Casper Wyoming has been found to 12.7 miles per hour and in Phoenix Arizona it is 6.2 mph. To test the relationship between the averages, the average wind speed has calculated for a sample of 31 days for each city. The results are reported below. Is there sufficient evidence at alpha = 0.05 to conclude that the average wind speed is greater in Casper or Phoenix ? Sample size Casper 31 Phoneix 31 Sample mean 12.85mph 7.9mph Sample standard deviation 3.3mph 2.8mph
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