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For a sample of 12 items from a normally distributed population for which the standard deviation is s=17.0, the sample mean is 230.8. At the 0.05 level of significance, test Ho:µ<= 220 versus H1:µ>220. Determine and interpret the p-value for the test.
A real estate investor has two houses: A and B. Each house may increase in value, decrease in value, or remain unchanged. Consider the experiment of investing in the two houses and observing the change (if any) in value:
Suppose that the population follows the normal distribution. Forty trucks are randomly selected and weighed. Within what limits will 95 percent of the sample means occur?
For the following scores, find the: A. Mean. B Median. C. Sum of squared deviation. D. Variance. E. Standard deviation.
Assume Nick doesn't know how his received he suppose that all three states of nature are equally likely to occur. If Nick uses the equally likely criterion illustrate what decision would he make.
At the .01 significance level, is there a relationship between job pressure and age?
Reject H0 at β β = .01; there is evidence of a difference between the mean voter turnouts for urban, suburban, and rural precincts.
Were the chi-square and regression tests presented and used correctly? Could the authors' analysis be recreated?
Suppose that this is a simple random sample of adult residents of Maine.
Determine the probability that mean annual snowfall during 40 randomly picked years will exceed 111.8 inches?
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
Given: You are using a significance level of α = 0.05 to test a claim that p > 0.5. Your sample is a simple random sample of size n = 49. Calculate β for the test, assuming that the true population proportion is 0.7 and showing all work.
Twelve case of leukemia are reported in people living in a particular census tract over a five year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cance-incidence rates?
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