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If the population mean is expected to be 85 and the sample mean is 80, the sample standard deviation is 2, and the sample consists of 100 consumers, the observed value of the Z-statistic is approximately
Find the probability that (i) the student took mathematics or history; (ii) the student does not take either of these subjects.
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Calculate the expectations of X and Y.
you are a medical claims processor for humana. claims arrive at your desk at an average rate of three claims per day
Telephone interviews were conducted on a representative sample of 1,003 adults living in the United States. For this sample, 506 adults admitted that they have paid to download music
business travelers use laptop computers on overnight business trips. State the hypotheses and test the assumption that two third of business travelers use a laptop (α = 0.05).
Calories in each hamburger measured. Can the reporter conclude, at α = 0.05, that the hamburgers from the two chains have a different number of Calories?
Construct a 96 percent confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
forecastinga all forecasts are never 100 accurate but subject to error. how is forecast error calculated? identify and
A state meat inspector in Iowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled "3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
in a poll respondents were asked whether they had ever been in a car accident. 177 respondents indicated that they had
question an outbreak of food-borne illness was attributed to salmonella. epidemiologists determined that the outbreak
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
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