TABLE 9-3 An Appliance Manufacturer Claims to Have Developed a Compact Microwave

question 91

True/False

TABLE 9-3
An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W. From previous studies, it is believed that power consumption for microwave ovens is normally distributed with a population standard deviation of 15 W. A consumer group has decided to try to discover if the claim appears true. They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.
-Referring to Table 9-3, for this test to be valid, it is necessary that the power consumption for microwave ovens has a normal distribution.

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A financial instrument designed to offer a steady flow of income to someone, mainly used for retirement purposes.

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Pertaining to something that occurs every three months or four times a year.

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An insurance product that pays out income over a fixed period or term, not necessarily for life.