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Quiz_3_KEY

# Quiz_3_KEY - BUAD 310 Quiz 3 KEY First name Last name Use...

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BUAD 310: Quiz 3 KEY First name: …………….…….….. Last name:…………….…….….. Use the following to answer questions 1 and 2: An assembly plant orders a large shipment of electronic circuits each month. The supplier claims that the population proportion of defective circuits is =.04. When a shipment arrives, the plant manager selects a random sample of 300 circuits that are tested and the sample proportion of defective circuits is computed. This result is used for a hypothesis test to determine if there is sufficient evidence to conclude that the population proportion of defectives circuits from this supplier is greater than .04. The hypotheses are: H o : and H a : . __C __1. For a level of significance of α=.025, what value does the sample proportion need to exceed in order for the manager to conclude that ? (a) .049 (b) .040 (c) .062 (d) .041 (e) .065 α=.025 Z=1.96 ̂ ̂ .062 __B__2. In a sample of 300 circuits, the manager found 21 that were defective. Determine the p-value associated with the test statistic for the test described above. (a) .07 (b) .0040 (c) .0207 (d) .9960 (e) .4721 ̂ P[ ]≈ .004 Use the following to answer questions 3 and 4: A manufacturer of light bulbs is considering a change in their supplier of tungsten for use in the bulbs’ filaments. They be lieve this will result in bulbs that are “longer lasting”. Currently, the lifetime, X, of their bulbs is a normally distributed ra ndom variable with population mean μ=750 hours. After using tungsten from the new supplier for a production run, a random sample of 25 bulbs will be selected and the average lifetime of the bulbs will be computed. This result will be used to determine if there is sufficient evidence to conclude that the population mean lifetime of bulbs using this supplier is greater than 750 hours. The hypotheses are: H o : μ ≤ 750 and H a : μ > 750. __B__3. The results of the sample showed an average lifetime of 753.3 hours with a sample standard deviation of 7.5 hours. Which of the following statements is true? (Choose the most appropriate response.) p-value < .025 __E__4. The production manager is concerned about the size of the sample used for the test. He decides to use a random sample of 100 bulbs using the new supplier’s material and repeat the test described above with a level of significance of α=.025.

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If it is true that using the new supplier results in bulbs that have a population mean lifetime of μ=753.12 hours and standar d
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Quiz_3_KEY - BUAD 310 Quiz 3 KEY First name Last name Use...

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