How to calculate standard deviation when only mean of the data …
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 …
Can I calculate the new standard deviation when adding a value …
and the updated standard deviation would be just the square root. If you want the population variance or standard deviation replace N-1 with N and N-2 with N-1.
self study - How can I calculate t-score without knowing true ...
From the sample you compute a) the degrees of freedom, which here is one less than the number of observations (n), b) the average vaue of the sample (X-bar), the sample standard deviation …
sample standard deviation given population standard deviation
May 23, 2016 · How do you find the sample standard deviation when given the population standard deviation? What formula do you use? If you can make up an example that would be …
Calculating mean and standard deviation of very large sample sizes
With standard deviation, it's a little more tricky, though. I've taken some time to run tests and found out that the standard deviation of a large sample size seems to be approximately similar …
Is it possible to find the combined standard deviation?
3 I had the same problem: having the standard deviation, means and sizes of several subsets with empty intersection, compute the standard deviation of the union of those subsets. I like the …
How to compute standard deviation of difference between two …
0 There are better ways to estimate the standard deviation of the difference of two independent emperical datasets, when the probability distributions are unknown. You can use convolution, …
How do I combine standard deviations of two groups?
Oct 26, 2018 · I know the means, the standard deviations and the number of people. I don't know the data of each person in the groups. Group 1 : Mean = 35 years old; SD = 14; n = 137 …
Calculating sample size with standard deviation?
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 …
Calculating sample size with unknown standard deviation
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% …