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Mathematics, 06.04.2020 18:38 lune1102

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 was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group is suspicious of the claim and believes it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W. What is the critical value with a level of significance of 0.05 and what is the test statistic and what is the p value?

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