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A rainstorm in Portland, Oregon, has wiped out the electricity in about of the households in the city. A management team in Portland has a big meeting tomorrow, and all members of the team are hard at work in their separate households, preparing their presentations. What is the probability that none of them has lost electricity in his/her household? Assume that their locations are spread out so that loss of electricity is independent among their households.
In a shipment of 56 vials, only 13 do not have hairline cracks. If you randomly select one vial from the shipment, what is the probability that it has a hairline crack?
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
Construct a decision table for this problem. Include all conditional values and probabilities in the table.
The average weight of adult men is 172 pounds with a standard deviation of 29 pounds. 30 men were asked their weight and the mean was calculated to be 181, test the hypothesis that the mean is not 172 pounds using alpha = .05.
Car X used k gallons of gas while traveling p miles, and car Y used s gallons of gas while traveling r miles. What was the ratio of the number of miles per gallon for car X to the number of miles per gallon for the car Y?
Predict the final average of a student who made an 83 on the first test. Give the value of r and r squared for this model. Interpret the value of r squared in the context of this problem.
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
If alpha level is changed from a = 0.05 to a = 0.01. What occurs to boundaries for critical region?
In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. Is this relationship positive, negative or no relation?
They both want to know what family member typically does the research about possible honeymoon destinations, and who primarily makes the decision on selecting the destination.
What is the probability that a soldier is a female?
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
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