An appliance manufacturer claims to have developed a compact microwave oven that

Question

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.

Q:Referring to Scenario 9-3, the parameter of interest is

A) the mean power consumption of all such microwave ovens. B)257.3. C) 250. D) the mean power consumption of the 20 microwave ovens.

Q:The power of a statistical test is 42) A) the probability of rejecting H0 when it is false. B)the probability of not rejecting H0 when it is true. C) the probability of rejecting H0 when it is true. D) the probability of not rejecting H0 when it is false.

Explanation / Answer

ans=

q1) A) the mean power consumption of all such microwave ovens.

q2)  C) the probability of rejecting H0 when it is true

p-value = 0.0013 < = 0.025, we reject H0.

Ho : u <= 250 versus H1 : u > 250

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