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A New York Times/CBS poll asked the question, "What do you think is the most important problem facing this country today?" It found that seventeen percent of the respondents answered "crime and violence." The margin of sampling error was plus or minus 3.7 percentage points. Following the convention that the margin of error was based on a 95% confidence interval, find the 95% confidence interval for the percentage of the population that would respond "crime and violence" to the question asked by the pollsters. (Express answers as decimal numbers to 3 places.)
A U.S. Travel Data Center survey of 1500 adults found that 42% of respondents stated that they favor historical sites as vacations. Find the 99% confidence interval of the true proportion of adults who favor visiting historical sites as vacations.
an accounting firm has been hired by a large computer company to test whether the proportion of accounts receivables
A group of investors wants to develop a chain of fast food cafés. In determining potential costs for each facility, they must consider, among other costs, the average monthly cost of electricity.
Report the test statistic and p-value. What is your decision and conclusion? State any assumptions you have made. Are these assumptions satisfied with these data?
The probability that home sales will increase in the next 6 months is 0.25. The probability that the interest rates on loans will go up in the same period is estimated to be 0.74.
What does it mean for two random variables to be uncorrelated?
The number of false alarms a building fire alarm system registers has a Poisson distribution with a mean of 6 false alarms per year. The variance of the number of false alarms is what?
A competitive school requires an applicant to have an IQ score in the top 10% of adults. What is the cutoff score?
Leggo's pesto is make from a recipe brought to America by an immigrant ancestor the present generation refers to as Bisnonna Maria.
Suppose it is known that a new treatment is successful in curing muscular pain in 75% of the cases. If it is tried on 9 patients, find the probability that fewer than 7 patients are cured.
The accountant will use a sample of weekend guest bills to test the manager's claim. Which form of the hypotheses should be used to test the manager's claim? Explain.
Solar cells are attached to a panel with a new heat resistant adhesive. The adhesive must provide 2.80 pounds of force in order to hold the cell on the panel. A random sample of 50 cells is tested and the following forces are necessary to break th..
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