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Biology and Environmental Science Jet-engine emissions at high altitudes cause vapor trails that contribute to cloud cover and pollution, and may even affect weather patterns. An experiment was conducted to measure the concentration of volatile organic compounds (VOCs) directly behind an operating engine. A random sample of jet engines was obtained. The VOC concentration was measured (in mg/m3) before and after a special exhaust scrubber was installed. The data are given in the following table.
Use the sign test with a = 0.05 to determine whether there is any evidence that the median VOC concentration is smaller when the scrubber is installed. Find the p value associated with this test.
Assuming that the manager wants at most a 5% chance of this happening, at what level should she set the mean fill level? Comment on the ramifications of this step, assuming that the company fills tens of thousands of cans each week.
(a) Argue that the ratio R = (X + Xi)/(Xi + · ··+ ..¥;) and its denomi nator (Xi + ··· + ..¥;) are independent. (b) Does SR/ 2 have an £-distribution with 2 and S degrees of freedom? Explain your answer. (c) Compute E(R) using Exercise 7.6..
What is the minimum number of gas stations that she should include in her sample if she uses the standard deviation estimate of $0.32, as reported in the popular press?
1.a company wants to know if minorities are more likely to be in certain job categories than others. their data base
a random sample of 100 credit sales in a department store showed an average sale of 120.00. from past data it is known
john beale of stanford ca recorded the speeds of cars driving past his house where the speed limit read 20 mph. the
The faculty senate at a large university wanted to know what proportion of the students thought foreign language classes should be required for everyone.
The incomes of trainees at a local mill are normally distributed with a mean of $1100 and a standard deviation $150. What percentage of trainees earn less than $900 a month?
Assuming that managers are correct that they have improved the error rate to 0.05, what is the probability that they would find 3 or more errors in a sample.
a certain city divides naturally into ten district neighborhoods. how might a real estate appraiser select a sample of
There are four distinct types of human blood denoted by O, A, B and AB. Suppose that these types occur with the following frequencies: 0.45, 0.40, 0.10, 0.05, respectively. If 20 people are chosen at random, what is the probability that:
The amphitheater operators believe that 9000 people is the optimal attendance in terms of comfort and profit. Is there any evidence to suggest that the true.
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