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After collecting a random sample of 101 individuals living in Arizona, you determine that the 95% confidence interval for the mean income is (62,489; 70,857). What was the standard deviation of income for the sample?
A medical insurance company wants to know whether the proportion of its customers requiring a hospital stay during a year will decrease if it provides coverage.
What are the upper and lower limits of the interval that contains 95% of all newborns in the United States?
The length of human pregnancies is approximately normal with mean 266 days and standard deviation 16 days. Find the mean. Draw a graph of this distrubtion.
a common mistake many statistics students make is saying we accept the null or prove the null instead of fail to
Use a 95% confidence interval to estimate the proportion of sports utility vehicles in California. How can you estimate the proportion of sports utility vehicles in California with a higher degree of accuracy?
Drilling down beneath a lake in Alaska yields chemical evidence of past changes in climate. Biological silicon (in milligrams of silicon per gram of water).
Is the correlation r for the data in Figure near -1, clearly negative but not near -1, near 0 clearly positive but not near 1 or near 1. Explain
Consider repair cost for Car A and Car B. The mean repair cost for each is $500 per year. Which statistics about repair cost may play into your decision to purchase one of these?
Interpret the standard error of the estimate? What information does this value provide to the researcher?
Compute the marginal frequencies. (List the totals for the age groups and localities). What percent of the urban dwellers are over 50? What percent of the Over-50 residents live in rural areas?
Describe before the Charter of Rights and Freedoms, how there was very little could be done about unjust laws passed by the government, specifically ones that violated civil and minority rights?
Prove that when the partial ordering over the set of stable matchings is , the minimum of the stable matchings A and B is A ∨m B.
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