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Question: 7 two types of plastic are suitable for use by...

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7. Two types of plastic are suitable for use by an electronic calculator manufacturer. The breaking strength of this plastic is important. It is known that σ-σ,-1.0 psi. From random samples of n1-10 and n2-12 we obtain У1-162.5 and у,-155.0. The company will not adopt plastic 1 unless its breaking strength exceeds that of plastic 2 by at least 10 psi. Based on the sample information, should they use plastic !? Set up and test appropriate hypotheses using α= 0.01.

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