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The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity). An economist selected a sample of 20 homeowners in New England and then calculated these total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
Homeowner Five Years Ago Now
1 17% 10%
2 20% 39%
3 29% 37%
4 43% 27%
5 36% 12%
6 43% 41%
7 45% 24%
8 19% 26%
9 49% 28%
10 49% 26%
11 35% 32%
12 16% 32%
13 23% 21%
14 33% 12%
15 44% 40%
16 44% 42%
17 28% 22%
18 29% 19%
19 39% 35%
20 22% 12%
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
Furnish 2 offices each with a desk, chair, and file cabinet and 2 bookcases. At a local store there are 6 models of desks, 8 models of chairs 4 models of file cabinets and 10 models of bookcases.
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From the given probability distribution finite the mean and standard deviation.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
For such groups of 800, would it be unusual to get 687 consumers who recognize the Dull Computer Company name?
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
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For the most recent year available, the mean annual cost to attend a private university in the United States was $20,182. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,400.
Estimate the 95% confidence interval for the proportion of the electorate that support this policy.
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