An appliance manufacturer claims to have developed a microwave oven that consumes a mean power of no less than 250 W. Fr

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An Appliance Manufacturer Claims To Have Developed A Microwave Oven That Consumes A Mean Power Of No Less Than 250 W Fr 1 (22.97 KiB) Viewed 13 times

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An appliance manufacturer claims to have developed a microwave oven that consumes a mean power of no less 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 determine if the manufacturer's claim appears true. They take a sample of 20 microwave ovens and find that they consume a mean power of 258.5 W.
Form appropriate hypotheses for the test above. A. Ho: = 250 W HA: 250 W B. Ho: H>250 W HA: ≤ 250 W C. Ho: 2 250 W HA: U <250 W D. Ho: ≤ 250 W HA: > 250 W
Calculate the value of the test statistic. A. -11.53 B. -2.33 C. 2.53 D. 11.33
At 1% significance level, the decision is to A. reject Ho; we cannot conclude that the microwave oven consumes a mean power of no less than 250 W B. reject Ho; we can conclude that the microwave oven consumes a mean power of no less than 250 W C. do not reject Ho; we cannot conclude that the microwave oven consumes a mean power of no less than 250 W D. do not reject Ho; we can conclude that the microwave oven consumes a mean power of no less than 250 W