Margin Of Error 0.045 Confidence Level 95
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Use The Given Data To Find The Minimum Sample Size Required To Estimate The Population Proportion
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Margin Of Error 0.07 Confidence Level 90 P And Q Unknown
OCTOBER 20, 2016 Font Size Login Register Six Sigma Tools & Templates Sampling/Data Margin of Error z score for 90 confidence interval and Confidence Levels Made Simple Tweet Margin of Error and Confidence Levels Made Simple Pamela Hunter 9 A survey is a valuable assessment tool 99 confidence interval in which a sample is selected and information from the sample can then be generalized to a larger population. Surveying has been likened to taste-testing soup – a few spoonfuls tell what the whole pot tastes like. The key to the http://www.chegg.com/homework-help/questions-and-answers/margin-error-0045-confidence-level-95-p-hat-q-hat-unknown-q5062644 validity of any survey is randomness. Just as the soup must be stirred in order for the few spoonfuls to represent the whole pot, when sampling a population, the group must be stirred before respondents are selected. It is critical that respondents be chosen randomly so that the survey results can be generalized to the whole population. How well the sample represents the population is gauged by two important statistics – the survey's margin of error and confidence level. They https://www.isixsigma.com/tools-templates/sampling-data/margin-error-and-confidence-levels-made-simple/ tell us how well the spoonfuls represent the entire pot. For example, a survey may have a margin of error of plus or minus 3 percent at a 95 percent level of confidence. These terms simply mean that if the survey were conducted 100 times, the data would be within a certain number of percentage points above or below the percentage reported in 95 of the 100 surveys. In other words, Company X surveys customers and finds that 50 percent of the respondents say its customer service is "very good." The confidence level is cited as 95 percent plus or minus 3 percent. This information means that if the survey were conducted 100 times, the percentage who say service is "very good" will range between 47 and 53 percent most (95 percent) of the time. Survey Sample Size Margin of Error Percent* 2,000 2 1,500 3 1,000 3 900 3 800 3 700 4 600 4 500 4 400 5 300 6 200 7 100 10 50 14 *Assumes a 95% level of confidence Sample Size and the Margin of Error Margin of error – the plus or minus 3 percentage points in the above example – decreases as the sample size increases, but only to a point. A very small sample, such as 50 respondents, has about a 14 percent margin of error while a sample of 1,000 has a margin of error of 3 pe
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