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, what is the parameter of interest?

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

Question

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, what is the parameter of interest?

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

Quizplus · Accepted Answer

The Answer of 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, what is the parameter of interest?

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

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