Q&A for How to Calculate Mean, Standard Deviation, and Standard Error

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How do you find the mean given number of observations?

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To find the mean, add all the numbers together and divide by how many numbers there are. e.g to find the mean of 1,7,8,4,2: 1+7+8+4+2 = 22/5 = 4.4.

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The standard error is calculated as 0.2 and the standard deviation of a sample is 5kg. Can it be said to be smaller or larger than the standard deviation?

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The standard error (SE) must be smaller than the standard deviation (SD), because the SE is calculating by dividing the SD by something - i.e. making it smaller.

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How can I find out the standard deviation of 50 samples?

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The results of all your figures (number plus number plus number etc.) divided by quantity of samples 50 =SD.

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How I use standard error?

Iris Victor

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The standard error is the standard deviation of any sample statistic, like sample mean, or sample median. Standard error is used to measure variability and how well a sampling distribution represents a population.

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Can standard error be expressed as a percentage?

Venatrixx

Community Answer

Yes. Once you have calculated your standard error, divide that value by the mean. This will give you the error as a percentage of the mean. If the standard error was 2 and the mean was 50, the error as a percentage would be 2/50 = 4%.

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