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1. Suppose Gallup takes a poll of 1000 voters from a population which is 56 percent Democratic. Letting P be the sample proportion, find
(a) Pr (.52 < p="">< .60).="">
(b) Pr (P > .5), i.e., the probability that the sample will correctly predict the election. Note how we are beginning to answer the problems raised in Chapter 1.
2. In tossing a fair coin 50 times, what is the probability that the proportion of heads will exceed .55?
verify that the function fx 3414x x 0 1 2... is a probability mass function. determine the requested probabilitiesa
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
Use simulation to find the expected value of the number of persons having knowledge of the rumor.
you conducted a chi-square goodness of fit test in your asci 691 capstone project. unfortunately you did not get the
If we assume a normal distribution and a standard deviation of σ = $0.20. , what proportion of passenger trips produced a revenue of less than $1.05?
A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams.
For your last homework assignment, one final visit to the bacteria in Bacteria.sav. As a reminder, the data contained in the file is as follows:Columns Description
Who owns iPods? As part of the Pew Internet and American Life Project, researchers surveyed a random sample of 800 teens and a separate random sample of 400.
to decide whether two different types of tennis raquet have the same true average power different raquets have been
Refer to the probability distribution for the sum of two dice. What is the value of P(X ≤ 4)? What does this probability measure? Explain what is measured by the value of 1 - P(X ≤ 4).
in a recent study of 35 ninth-grade students the mean number of hours per week that they played video games was 16.6.
(a) Find the proportion of customers that go away empty handed. (b) Find the average time that an item is on the shelf. (c) Find the average number of items on the shelf.
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