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 appropriate hypotheses to determine if the manufacturer's claim appears reasonable are

Question

Quizplus · Accepted Answer

The null hypothesis should reflect the manufacturer's claim that the average power consumption is no more than 250 W, which translates to µ ≤ 250. The alternative hypothesis should test if the average power consumption is greater than 250 W, which is µ > 250.

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