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In a study of elephants a researcher wishes to determine the average weight of a certain subspecies of elephants. From previous studies, the standard deviation of the weights of elephants in this subspecies is known to be 1500 pounds. How many elephants does the researcher need to weigh so that he can be 80% confident that the average weight of elephants in his sample is within 350 pounds of the true average weight for this subspecies?
A. 31B. 39C. 50D. 166
How large should n be so that the standard deviation of is no more than 0.01 and sampling distribution
Compute a 3 month moving average forecast of demand for April through January (of the next year). Compute a 5 month moving average forecast for June through January
Suppose that January sales for the fourth year turn out to be $295,000. What was your forecast error? If this is a large error, Karen might be puzzled about the difference between your forecast and actual sales value.
When comparing data from different distributions, what is the benefit of transforming data from these distributions to conform to the standard distribution?
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
Illustrate what is the probability all four calls are infact emergencies. Illustrate what is the probability that three or more calls are not emergencies.
When we have data that are measured at the interval/ratio level of measurement, there are:
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
A random sample of 25 injections resulted in a variance of 0.135 test if the apparatus has a greater variance than the desired one.
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
Define, describe and provide an example of the Komologrov-Smirnov distribution. Use MS-Excel (if possible) to solve this problem, also Show all your work in obtaining the answer.
What is the probability of randomly selecting a male from this group?
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