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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?
Calculate the mean, median, and mode for the total murders in the top 20 states. Calculate the standard deviation and variance for the total murders in the top 20 states
How many citizens would need to be sampled if a 99% confidence interval was desired to estimate the true proportion to within 1%?
Explain why random samples are preferred to nonrandom samples.
14 machines are planned to be used for a 60-day production run for a customer. The operating time is 1660 hours. Upon failure, a machine must be returned to the manufacturer for repair.
suppose 13 of american adults believe that the highest priority of america is to protect freedom of speech. we will
a fair coin is tossed 500 times. find the probability of obtaining more than 300 heads.a.0b.
Colleges typically use grade point average cutoffs to decide who graduates with honors and who is accepted into certain programs (such as teacher education, for example).
Suppose an engineer proposes a new model that will weigh 3100 pounds. What could we expect the miles per gallon in the city performance would be?
Solve the following confidence interval and interpret your results. Explain how you arrived at your result. Use Excel to show work if necessary.
Carpet City wants to develops a means to forecast it carpet sale. The store manager believes that the store's sale are directly related to the number of new housing starts in town.
assume that you have a sample of n18with the sample mean xbar1 42and a sample standard deviation of s1 4and you have
Generate descriptive statistics. Create a stem-and-leaf plot of the data and box plot of the data.
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