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17 Sep 2013 Part two shows you how to find a sample size for a given confidence interval and width (e.g. 95% interval, 6% wide) for an unknown population
21 Mar 2012 Sample Size: Smaller sample sizes generate wider intervals. There is an inverse square root relationship between confidence intervals and
The confidence level tells you how sure you can be. It is expressed as a percentage and represents how often the true percentage of the population who would pick an answer lies within the confidence interval. The 95% confidence level means you can be 95% certain; the 99% confidence level means you can be 99% certain.
Find out fast with our easy-to-use sample size calculator. The higher the confidence level you want to have, the larger your sample size will need to be.
This means we get started with a set level of confidence and margin of error. We can use these pieces to determine a minimum sample size needed to produce
If 90% of respondents answer yes, while 10% answer no, you may be able to tolerate a larger amount of error than if the respondents are split 50-50 or 45-55. Lower margin of error requires a larger sample size. The confidence level is the amount of uncertainty you can tolerate.
The value in the next column is the sample size that is required to generate a This will construct a 95% confidence interval with a Margin of Error of about
2 Nov 2010
Determine the minimum sample size for finding a confidence interval for a proportion. 6. Find a confidence interval for a variance and a standard deviation. 7.
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