Suppose that you’re thinking about buying a used R-car at Honest Abe’s. In order to make an informed decision you look up the records in an auto magazine and find that 30% of these cars have a faulty transmission. To get more information you hire a mechanic who is excellent: Of all the faulty cars he has examined in the past he correctly judged that 90% were “faulty” and only erroneously judged 10% as “OK.” He ‘s almost as good at judging good cars: Of all the good cars he’s correctly judged that 80% were “good” and only erroneously judged 20% as “faulty.”
What is the probability that the R-car you’re thinking of buying has a faulty transmission before you hire the mechanic?
.41
In a random sample of 500 college students at WVU, 72% indicated they preferred to study while listening to music or some kind of background noise while others indicated they liked to study in a quiet setting. What is the 99% confidence interval for music/background noise studying?
.72 ± 034
72 ± 14.14
.72 ± 202
.72 ± .093
.72 ± .052
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