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A statisitcs professor plans classes so carefully that the lengths of her classes are uniformly distributed between 45.0 and 55.0 minutes. Find the probability that a given class period runs less than 50.5 minutes.
The Rio-River Railroad, headquartered in Santa Fe, New Mexico, is trying to devise a method for allocating fuel costs to individual railroad cars on a particular route between Denver and Santa Fe.
According to study done by Nick Wilson of Otago University, the probability a randomly selected individual will not cover his or her mouth when sneezing was 0.267. Suppose you sit on a mall bench and observe 200 people pass by as they sneeze.
At the 0.05 level of significance, test whether the mean baseline body mass index for the population of middle aged men who develop diabetes is equal to 24.0 kg/m 2 , the mean for the population of men who do not. What is the p-value of the test?
Multiple choices based on regression analysis - the percentage of variation in the dependent variable explained by the variation in the independent variable
Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
Perform the appropriate test for a difference in mean blood glucose and report the p-value for the two-tailed test of significance, assuming that the variances are equal.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
A building contractor pays $500 to bid on a contract. If he gets the contract, the probability of which he estimates to be 0.70, he will make a profit of $50,000.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
The mean number of passengers per cruise is 1,820 and the standard deviation is 120.
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