STA3032 Quiz 8 Solutions

# STA3032 Quiz 8 Solutions - STA3032 QUIZ 8 Solutions Spring...

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STA3032 QUIZ 8 Solutions Spring 2011 Problem 1 on page 441 (Section 6.7) A crayon manufacturer is comparing the effects of two kinds of yellow dye on the brittleness of crayons. Dye B is more expensive than dye A, but it is thought that it might produce a stronger crayon. Four crayons are tested with each dye and the impact strength (in joules) is measured for each. The results are as follows: Dye A 1.0 2.0 1.2 3.0 Dye B 3.0 3.2 2.6 3.4 Show ALL steps of hypothesis testing in your answer to the following questions. Explain what you are doing and why. a) Can you conclude that the mean strength of crayons made with dye B is greater than that of dye A? 1. Assumptions i. SRS? It is not stated how the sampled crayons are selected. We must assume that they are randomly and independently selected. ii. Quantitative variable? Yes. The random variable here is the strength of the crayons, measured in joules and it is a quantitative variable. iii.

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STA3032 Quiz 8 Solutions - STA3032 QUIZ 8 Solutions Spring...

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