Oct 26, 2018 · 0 expanding on the response of heropup: If you want to combine the weighted variances/standard deviations the formula is quite similar.

Sep 6, 2023 · see below the answer by : Graipher allows calculating the standard deviation from the mean and the number of samples. The mean of this distribution is given by μ=np , where n is the …

Nov 29, 2020 · Is it possible to calculate the standard deviation of a single yes/no question? For example, 100 people took the survey and 60 of them chose "yes", 40 of them chose "no".

Aug 30, 2020 · The population standard deviation is relevant where the numbers that you have in hand are the entire population, and the sample standard deviation is relevant where the numbers are a …

This is actually computationally efficient, because you just need to count the number of samples, the sum of the samples, and the sum of the squares of each sample. Once you need to "read" the …

Dec 25, 2024 · 4 I found a study that reports the following data for two groups: Mean (7.5 and 8.68) Sample size of each group (26 and 22) P-value from the independent one-tailed t-test (0.055) Is …

Aug 17, 2016 · Using the sample standard deviation, for n=2 the standard deviation is identical to the range/difference of the two data points, and the relative standard deviation is identical to the percent …

Nov 25, 2017 · What is an estimator of standard deviation of standard deviation if normality of data can be assumed?

The formula for standard deviation is sqrt ( [sample size] [probability of success] (1- [probability of success])). To find the sample size from the mean and success rate, you divide the mean by the …

I want to find the standard deviation of the percentages, but weighted for their data volume. ie, the first and last data points should dominate the calculation.