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A manufacturer of cookies and crackers does a small survey of the age at sale of one of its brands. A random sample of 33 retail markets in a particular region is chosen. In each store, the number of days since manufacture of the frontmost box of crackers is determined by a date code on the box. The data (age in days) from the 33 stores showed the sample mean to be 56.869 days, and the sample standard deviation to be 28.97 which almost precisely estimated the population standard deviation. Suppose the manufacturer wants to obtain a 90% confidence interval with a margin of error that depicts 5 days between the lowest and highest points of the interval. Assuming that the sample standard deviation does not change, how large a sample is needed? Show all work.
Compute the coefficient of determination and interpret its meaning and compute the standard error of estimate, and interpret its meaning.
The probability that 0, 1, 2, 3 or 4 people will seek treatment for the flu during any given hour at any given emergency room is shown in the following distribution. What are the variance and standard deviation of X?
you plan to develop a new software system that you believe will surpass the success of google and facebook combined. in
The Penguin Company employs 200 men and 50 women. Of the male employees, 140 work in the plant, 20 are in the office, and 40 are field salesmen.
A random sample of 28 executives gives x = 6.7 years and s = 2.4 years. Give a 99% con?dence interval for the average number of years of experience for all executives in this branch.
a. Specify the competing hypotheses to determine whether color preference depends on gender. b. Compute the value of the test statistic.
suppose the probability distribution x number of jobs held during the past year for students at hfcc is as followsx 0
Now suppose he says that if he is optimistic about the success of one project, he is likely to be optimistic about the others as well. For your simulation, this means that if one of the probabilities increases, the others also are likely to increa..
Suppose that when a transistor of a certain type is subjected to an accelerated life test, the lifetime X (in weeks) has a gamma distribution with mean 24 weeks and standard deviation 12 weeks.
A scientist suggests that X ~ Beta(a = 5, ß = 2) is a good model for the proportion of surface area in a randomly selected quadrat that is covered
If the experiment is repeated many times, what will be the approximate proportion of times that the value is -1? Give a reason for your answer.
Find the probability that the first selected light bulb is good and the second light bulb is also good. (Show all work. Just the answer
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