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Among drivers who drive daily about 40% have gotten a speeding tickets at one point or another. There is a statistics class of 80 students and 10 of them can actually drive every day. Using this information, answer the questions below.
For full marks your answer should be accurate to at least three decimal places.
a) How many of the drivers in the class would you expect to have had a speeding ticket?b) What is the probability that the number of those who have had tickets is 4?c) What is the probability that the number of those who have had tickets equals 2 or 6?d) What is the probability that the number of those who have had tickets is less than or equal to 8?
The standard deviation of the differences d for the paired sample data s d = ____________
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Test this problem at 99% confidence and provide conclusion. Would the problem have a similar conclusion if we knew the population standard deviation was $40,000? Why?
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A recent poll of 700 people who work indoors found that 278 smoke. If the researchers want to be 98% confident of their results to within 3.5 percentage points, how large a sample is necessary?
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