Question

TABLE 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.

Answer 1

Option B is correct.

That is the parameter of interest is the mean power of consumption of all such microwave ovens.

Reason:

Since parameters are about the whole population hence our parameter of interest would be mean power of consumption of all such microwave ovens not only of just 20 microwave ovens. and in given question appliance manufacturer claims about all microwave ovens that is population. so option B is correct