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 …

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 …

Oct 20, 2019 · The sample standard deviation is given by so having suffices for calculating the sample standard deviation.

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 …

I'm having troubles with understanding a problem which is basically asking to calculate a sample size (in order to estimate what portion of population has income more than 40K) with 95% confidence ...

Jan 17, 2020 · A sample of 25 customers is selected at random. The average delivery time in the sample was 13 minutes with a sample standard deviation of 4 minutes. a) Test to determine if we can infer at …

Nov 29, 2020 · You can talk about the standard deviation of random variables. What you have described as a "yes/no question" is not in and of itself a random variable. The formula you cite is for the …

Nov 18, 2021 · Given a mean of $5.60$ and a standard deviation of $0.13$ is there a way of finding out how many individual values produced this mean and what those values were?

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 …