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

question 169

Multiple Choice

SCENARIO 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 Scenario 9-3,the population of interest is

• A)the power consumption in the 20 microwave ovens.
• B)the power consumption in all such microwave ovens.
• C)the mean power consumption in the 20 microwave ovens.
• D)the mean power consumption in all such microwave ovens.

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