An appliance manufacturer claims to have developed a compact microwave oven that

Question

An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. Form previous studies, it is believed that power consumption for microwave ovens in normally distributed with a 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 an average of 257.3 W. Referring to Table 9-3. the population of interest is a) the power consumption in the 20 microwave ovens. b) the power consumption in nil such microwave ovens. c.) the mean power consumption in the 20 microwave ovens. d) the mean power consumption in all such microwave ovens. Referring to Table 9-3, the parameter of interest is a) the mean power consumption of the 20 microwave ovens. b) the mean power consumption of all such microwave ovens. c) 250 d) 257.3 ANSWER: TYPE: MC DIFFICULTY: Easy KEYWORDS: one-tailed test, mean, Z test, parameter Referring to Table 9-3, the appropriate hypotheses to determine if the mamifacU appears reasonable are: a) H_0: mu = 250 versus H_1: mu notequalto 250 b) H_0: mu greaterthanorequalto 250 versus H_1: mu 250 d) H_0: mu greaterthanorequalto 257.3 versus H_1: mu

Explanation / Answer

12) the power consumption in all such microwave ovens

13) the mean power consumption in all such microwave ovens

14) Option C.

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