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. a. What is the population of interest? b. What is the parameter of interest? c. Is there evidence at 0.05 significance level that the mean power consumption is more than 250 W? Please use PH Stats in Excel and show the steps

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