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According to an IRS study, it takes a mean time of 330 minutes for taxpayers to prepare, copy and electronically transfer a 1040 tax form. The standard deviation of this distribution is 80 minutes. A consumer watchdog agency selects a random sample of 40 taxpayers for further study.
A. What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample mean for samples of size 40?
B. What is the probability that the sample mean is greater than 350 minutes?
The effectiveness of short term relaxation and cognitive-behavioral
Two-liter plastic bottles used for bottling cola are shipped in lots of 100. Suppose the lots are 5 percent defective. Some bottles leak, some are too small, and so forth.
Determine the average number of people you should ask in order to determine someone with same birtheday as yours.
Assume that standard deviation is $3,204 and that 36 four-year institutions are arbitarily selected. Determine the probability that sample mean cost for these 36 schools is less than $25,000.
There is significant evidence at alpha=0.05 t o show that the populations of endotoxin levels in children living varying distances from operating farms are not equal.
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
Examine the plot of the regression residuals against t. Is there a tendency for the residuals to have long positive and negative runs? To what do you attribute this phenomenon?
given the probability that james will go the gym after work is 28 and the probability that sam will go the gym after
At.05 level of significance test to find out if number of breakdowns is independent of shift.
What is the probability that a consumer selected at random purchased the same number or more products than before?
a mean of 20 minutes and a standard deviation of 3 minutes. how long does it take the slowest 10% of the students to walk from the dorms to the chemistry lab.
Lashing together logs of diameter .30m and length 1.8m. How many logs will be needed to keep them afloat in fresh water. take the density of the logs to be 800kg/m^3.
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