15) A maker of microwave ovens advertises that less than 10% of its microwaves need repair during the first two years of use. In a random sample of 57 microwaves, 18% needed repairs. Can you reject the claim that less than 10% of microwaves need repair during the first two years of use? Assume that the original population is normally distributed.
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Sri K.
A microwave oven repairer says that the mean repair cost for damaged microwave ovens is les than $100. You work for the repairer and want to test the claim. You find that a random sample of 5 microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. You want to test the claim at a alpha level of .01. Choose the result that provides the result of this claim a. Accept Ho (the claim that repair cost is less than or equal to $100), since t calculated of 4.472 is greater than critical t of 3.747 b. Reject Ho (the claim that repair cost is less than or equal to $100) since t calculated of -4.472 is less than a critical t value of -3.747 c. Accept Ho (the claim that repair cost is less than or equal to $100) since t calculated of -4.472 is less than a critical t value of 3.747 d. Reject Ho (the claim that repair cost is less than or equal to $100) since t calculated of 2.132 is less than a critical t of 3.747
Madhur L.
For the following: a. Identify the H0 and Ha. b. Determine whether the test is left-tailed, right-tailed, or two tailed. c. Determine whether to use a z-test, t-test, or a X²-test, explain d. Find the critical value(s) and sketch a graph identifying the rejection region(s) e. Decide whether to reject or fail to reject the null hypothesis. Then interpret the decision in the context of the original claim. 2 A maker of microwave ovens advertises that no more than 10% of its microwaves need repair during the first five years of use. In a random sample of 57 microwaves five years old, 13% needed repairs. At α = 0.04 , can you reject the maker’s claim that no more than 10% of its microwaves need repair during the first five years of use?
Adi S.
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