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

question 171

Multiple Choice

TABLE 9-3
An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it is believed that power consumption for microwave ovens is 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 mean power consumption in the 20 microwave ovens.
• B) the power consumption in the 20 microwave ovens.
• C) the mean power consumption in all such microwave ovens.
• D) the power consumption in all such microwave ovens.

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