Sample Size Mean Estimation Tool
Sample Size – Mean Estimation
When to use this tool
•
Use the Sample Size Calculator to obtain the sample
size required to estimate a population mean (average)
with a specified confidence level and precision (margin
of error).
The calculator displays the sample size required to estimate
the true value of the mean with the desired precision and
confidence for a large or infinite population.
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Using EngineRoom
Measure > Sample Size Calculator > Sample Size – Mean Estimation
Sample Size – Mean Estimation Example
Find the sample size required to estimate the
population mean given the following information:
•
Historical value of the population standard deviation
= 18 units
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Desired margin of error = +/- 10 units
•
Desired significance level (= 1 - desired confidence
level) = 1 - 0.95 = 0.05
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Follow the 3 Specification windows and enter the
given information.
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Click “Continue.”
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Sample Size – Mean Estimation Output
The study displays the sample size
required to estimate the population mean
for the given inputs.
In this example, it is 13.
Use the Sample Size Calculator to determine the sample size needed to estimate a population mean with a specified confidence level and precision. Input historical standard deviation, desired margin of error, and significance level to obtain the sample size. Follow the steps provided in the tutorial to calculate the required sample size accurately.
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Presentation Transcript
Sample Size Mean Estimation When to use this tool Use the Sample Size Calculator to obtain the sample size required to estimate a population mean (average) with a specified confidence level and precision (margin of error). The calculator displays the sample size required to estimate the true value of the mean with the desired precision and confidence for a large or infinite population. Note: The calculator assumes the mean of a normal distribution is to be estimated. The required inputs are the assumed/historical value for the standard deviation, the desired precision of the estimate, and the desired level of risk or significance. Tutorial: https://media.moresteam.com/university/tutorials/nonint/new/SampleSize.mp4 Tutorial: https://media.moresteam.com/university/tutorials/nonint/new/SampleSize.mp4
Using EngineRoom Measure > Sample Size Calculator > Sample Size Mean Estimation
Sample Size Mean Estimation Example Find the sample size required to estimate the population mean given the following information: Historical value of the population standard deviation = 18 units Desired margin of error = +/- 10 units Desired significance level (= 1 - desired confidence level) = 1 - 0.95 = 0.05 Steps: Follow the 3 Specification windows and enter the given information. Enter the historical standard deviation value as 18. Click Continue. Enter the desired margin of error as 10 and click Continue. Enter the significance level (alpha) as 0.05 and click Continue.
Sample Size Mean Estimation Output The study displays the sample size required to estimate the population mean for the given inputs. In this example, it is 13.
