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Question: Immigration (optional). In the setting of Exercise, what is the probability of getting a sample in which more than 51% of those sampled think that the level of immigration to this country should be decreased?
Exercise: Immigration. Suppose that 55% of all adult American think that the level of immigration to this country should be decreased. An opinion poll interviews 1007 randomly chosen Americans and records the sample proportion who feel that the level of immigration to this country should be decreased. This statistic will vary from sample to sample if the poll is repeated. The sampling distribution is approximately Normal with mean 0.55 and standard deviation about 0.016. Sketch this Normal curve and use it to answer the following questions.(a) The mean of the population is 0.55. In what range will the middle 95% of all sample results fall?(b) What is the probability that the poll gets a sample in which fewer than 53.4% say the level of immigration to this country should be decreased?
The J.J. Bone Company uses exponential smoothing to forecast the average daily call volume at its call center. The forecast for last month was 782, and then the actual value turned out to be 792.
The restaurant is open 16 hours each day and the daily expenses are 4500. Using a normal approximation, estimate the probability that on a given day, revenue will cover expenses.
let x and y be independent and identically distributed random variables with common standard normal pdf offz
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
according to the pew internet amp american life project 75 of american adults use the internet. the pew project authors
According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that none of them enjoy drinking beer.
A population of scores forms a normal distribution with a mean of U=80 and a standard deviation of o=10 a. What proportion of the scores have values between 75 and 85? b. For samples of n=4, what proportion of the samples will have means between 75..
one piece of pvc is to be inserted inside another piece. the length of the first piece is normally distributed with a
Jerry Jansen, Materials Handling Manager at the CasperEdison Corporation's new factory, needs to make a purchasing decision. He needs to choose between two types of materialshandling equipment, a small tractor-trailer train and a heavy-duty forkli..
the breaking strength of a rivet has a mean value of 10050 psi and a standard deviation of 505 psi.a what is the
in a class 20 of the students are male and 80 female. among male students 40 wears eye glasses among female students 30
Consider the linear transformation T : complex numbers^n -> complex numbers^n given by T( z1, z2, ... , zn ) = ( a1z1, a2z2, ... , anzn). What is the dimension of the subspace spanned by the eigenvectors of T? Exhibit a basis for this space, and g..
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