Instruction 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 Instruction 9-3,the parameter of interest is
A) the mean power consumption of the 20 microwave ovens.
B) 257.3.
C) the mean power consumption of all such microwave ovens.
D) 250.

Question

Quizplus · Accepted Answer

The parameter of interest refers to the characteristic that the study aims to estimate or test across the entire population, not just the sample. In this context, it is the mean power consumption of all such microwave ovens the manufacturer claims to have developed, not just the mean of the sampled 20 ovens, a specific value, or the claimed mean.

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