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A random sample of 50 price changes is selected from the many listed for a large super- market during a reporting period. If the probability that a price change is posted correctly is .93, Write an
A survey is conducted to estimate the percentage of pine trees in a forest that are infected by the pine shoot moth. A grid is placed over a map of the forest, dividing the area into 25-foot by 25-f
The probability that a randomly selected person has high blood pressure and is a runner is 0.2. Find the probability that a randomly selected person has high blood pressure, given that he is a runne
What can be said about the approximate percentage of observations between 3200 and 3600? (Round the answer to the nearest whole number.)
The question: "Two distinct integers are chosen at random and without replacement from the first six positive integers. Compute the expected value of the absolute value of the difference of these tw
A university has 1000 computers available for students to use. Each computer has an 850-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives.
She sampled 20 teams from 2012 NFL season and found the average fan cost index to be $440 with a standard deviation of $83. a. What is our population mean? What is our best estimate?
Assuming that training can affect the average time but not the standard deviation, the managers are interested in knowing to what level the mean call time needs to be reduced in order to meet the 1
Assume that the time required to download a file from the iTunes is exponentially distributed with mean equal to 4 minutes. What is the probability that a download will require no more than 2 minute
An experiment involves selecting a random sample of 256 middle managers. One item of interest is their mean annual income. The sample mean is computed to be $35,420 and the sample standard deviation
What is the probability of obtaining 2 heads out of 5 tosses of a coin in a binomial distribution?
In a random sample of 5 parts on an assembly line, the probability that one of the parts is a defect is 15% and follows a binomial distribution. What is the probability of 3 or 4 parts being defecti
What is the probability of a person having cancer given that the test does not indicate cancer?
It has been estimated that the probability of a male birth is 0.513. If a couple have five children, determine the probability of the following scenarios:
In the Fall semester of 2011, 48.1 % of students at UTA were women. Suppose that two students from UTA are selected at random. Using the probability tree method, calculate: The probability of gettin
Describe how a simple random sample of 30 women can be selected from the pool of 2,500 available for the study. b. Comment on whether the results of this study can be generalized to all adult women
Why is the probability of getting two red balls when sampling without replacement close to the probability of getting two red balls when sampling with replacement?
A resent report indicated an average family of four 2 parents and 2 children under the age of 16, spends $500 per month on gaoline. Assume the distribution of gasoline consumption expenditures for a
Assume that event A occurs with probability 0.4 and event B occurs with probability 0.5. Assume that A and B are disjoint events. The probability that either event occurs (A or B) is
Find the inverse cdf of given distributions using R: Let the inverse cdf to be a r.v. U which follows the Uniform(0,1)
Using the graph what is the probability of a Type II error if th true average IQ is 144? What must I do in order to force this Type II error to be exactly equal to Type I error? Compute an Interval
A researcher, concerned about the foreign ownership of the retail Trade industry in the U.S. , conducts a survey of retail firms in the country. In a sample of one hundred retail firms the researche
Use Inverse Transform Method to create the following r.v.s using R