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. What are the appropriate hypotheses to determine if the manufacturer's claim appears reasonable? but OA. Ho: 250 versus H: 250 OB. Ho p250 versus H: 250 OD. Ho: 257.3 versus H: