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An ecologist studying the breeding habits of birds sent volunteers from the local chapter of the Audubon Society into the field to count nesting sites for a particular species. Each team was to survey five acres of land carefully. Because she was interested in studying the distribution of nesting sites within a particular kind of ecological system, the ecolo- gist was careful to choose survey sites that were as similar as possible. In total, 24 teams surveyed five acres each, and reported the following numbers of nesting sites in each of the five-acre parcels:
7
12
6
9
5
2
3
1
10
8
4
13
a. Plot a histogram for these data.
b. What kind of theoretical distribution might you select to represent the distribution of the number of nesting sites? Why?
c. Estimate the parameters of the theoretical distribution by calculating the sample mean and sample variance.
d. Plot the probability distribution based on your theoretical model from parts b and c. How does it compare to your histogram from part a?
statistics is a method of decision making in the face of uncertainty and the basis of numerical data and calculated
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several years of study by dedicated researchers have shown that on average 4 sharks per month can be found in an area
calculate a 99 confidence interval for the true mean of a bearings diameter when a sample of 16 of the bearings have a
If he knows that the measurements follow a normal distribution and the standard deviation for this procedure is 1.2 degrees, what is the confidence interval for the population mean at a 95% confidence level?
A drug manufacturer wants to estimate the effect of its new drug designed to increase patients white blood cell count.
suppose a random sample of 100 u.s. companies taken in 2005 showed that 21 offered high-deductible health insurance
What is the average time that a customer spends waiting to be called to a chair?
In a class of 40, 16 driver a car made outside the United States. What is the confidence interval for the total population of students at the 95% level?
A new manufacturing procedure has been proposed to reduce the amount of aluminum that must be recycled in this way. For a sample of 35 castings made with the new process, data file XR10111 lists the weights of aluminum trimmed and recycled. Base..
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