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The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,10 hours (90 days). As an experiment, Holdlonger was added to the chlorine to find weather it would increase the shelf life. A sample of nine jugs of chlorine had these shelf lives (in hours):
02, 1592,1702,1802,1792,1602,1672,1712,1812,185
At the .025 level, has Holdlonger increased the shelf life of the chlorine? Estimate the p-value.
The researcher found that Lincoln's educational score did not correlate with the expected variables.
The typical homeowner has a utility function equal to the square root of wealth. Will the homeowner retrofit the house, and if so, which insurance policy will the homeowner buy?
In the past few years out sourcing over seas has become more frequently used than before by U.S. companies. However, out souring is not with out problems. A recent survey indicates that 20% of the companies that outsource over seas use consultant.
A sample of n=20 has a mean of M=40. If the standard deviation is s=5, would a score of x=55 be considered an extreme value?
What is the mean and standard deviation of the number preferring the incumbent and what is the probability that more than 68% will favor the incumbent?
A smuggler places 3 narcotic tablets in a bottle of 21 vitamin pills for a total of 24 pills. If U.S. customs tests 2 pills at random what is the probability that at least 1 narcotic pill will be found?
Determining the strength of a correlation is very important to determine how well one variable can predict another. To determine the strength of a correlation, we have to calculate the correlation coefficient, r.
At a certain pizza parlor, 45% of the customer's order a pizza containing onions, 38% of the customer's order a pizza containing sausage, and 79% order a pizza containing onions or sausage
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
He is sorry but there is a 99.9% (1-0.001) chance that you have HIV. Is he correct? What is the actual probability that you are HIV positive?
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
The average diameter of sand dollars on a certain island is 3.60 centimeters with a standard deviation of 0.90 centimeters. If 36 sand dollars are chosen at random for a collection
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