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20% of the students at a large university live in residence. If a random sample of 200 st diners is selected, what is the probability that
a) between 35 and 50 students inclusive live in residence?
b) 35 or fewer live in residence?
What information would you need to determine the probability that postage forone particular week will exceed $400? Why wasn't this information required for(a)
A young woman in that age group is randomly selected; independently, a young man in that age group is randomly selected. What is the probability that the young man is taller than the young woman by more than 5 inches
Suppose you forecast that the Swiss franc will appreciate by 3 percent over the next year, but you realize that there is much uncertainty surrounding your forecast.
What is the average number of callers waiting to place an order? (c) Ashleys is considering adding a second clerk to take calls. The store would pay that person the same $ 10 per hour. Should it hire another clerk?
There are 40 students in the class. The instructor received the opinions of 3 students who remained after class one day to complain about the exam.
The moment generating function for a random variable X is MX(t) = eat+ßt2/2. Find the mean and variance of X.
(a) State formally the hypotheses necessary to conduct a directional test of no difference between the two population means.
Answer the following three questions based on what you know about statistics now.
The number of requests for assistance received by a towing service is a Poisson process with average of 4 requests per hour*. a) Compute the probability that exactly ten requests are received during a particular 2 hour period.
Is there an association between time of year and the nighttime temperature in North Dakota?- What might you expect the correlation between DayNumber and Temperature to be? Explain.
Suppose the confidence interval obtained in part a is too wide. How can the width of this interval be reduced? Describe all possible alternatives.
Translate the following arguments into symbolic form and use the first four rules of inference to derive the conclusion of each.
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