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A fish story
Concerned about reports of discolored scales on fish caught downstream from a newly sited chemical plant, scientists set up a field station in a shoreline public park. For one week they asked fishermen there to bring any fish they caught to the field station for a brief inspection.
At the end of the week, the scientists said that 18% of the 234 fish that were submitted for inspection displayed the discoloration. From this information, can the researchers estimate what proportion of fish in the river have discolored scales? Explain.
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
suppose that you want to test for a difference in proportion between two groups. group 1 has 80 respondents and 40 of
It has been determined that the mean life is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of the bulbs will last between?
You operate a delivery service in your local area, but you are thinking of expanding to another market. You're concerned that you might need to set different prices in the new market because the cost of gas might be much different.
If you were to draw another random sample of 20 observations from the same population, what is the probability that you would find a larger sample mean than the value you calculated in question 1?
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribtion of the battery lives closely follows the normal probability distribtion with a standard deviati..
an electronics store sells an average of 60 entertainment systems per month at an average of 800 more than the cost
Enforced Separation in 3-Dimensional Assignment) Consider the 3-dimensional assignment problem of Example 10.7 that involves a set of jobs J, a set of machines M, and a set of workers W.
A catering service offers 6 appetizers, 10 main courses, and 11 desserts. A banquet chairperson is to select 2 appetizers, 6 main courses, and 9 deserts for a banquet. In how many ways can this be done?
The board of directors of Saner Automatic Door Company consists of 12 members, 3 of whom are women.
1.The Vintage Restaurant, on Captiva Island near Fort Myers, Florida, is owned and operated by Karen Payne.
Test the hypothesis that the median weight of NFL players is 250 pounds against the alter- native that it is greater at α = 0.05, using (a) the large sample sign test and (b) the Wilcoxon signed rank test.
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