A researcher expects the population proportion of the cubs
A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
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Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 units. What would be the required sample size?
How did the weaknesses of the Roman economy in the Western Empire affect the Empire, and in what way did these weaknesses lead to the fall of Rome?
Calculate a confidence level at 95% to get an interval estimate for proportion?
In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?
From your own readings, study, and personal experience, contrast the living conditions of people living in post-industrial countries (e.g., the United States) with those in pre-industrial or emerging countries.
Survey to determine what proportion of new car buyers continue to have their car serviced at the dealership after warranty ends. Estimates 30% of customer do so.
A machine produces 3 inch nails. A sample of 100 nails is selected, and it is found that 25 are shorter than 3 inches. Find the 95% confidence interval on the proportion of all such nails that are shorter than 3 inches.
When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?
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