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. Share
Calculating sample size with unknown standard deviation
The standard deviation is not given and it says that I should take a maximum possible value for that. In addition, it says that 2 should be used as the quantile of the normal distribution of …
Calculating mean and standard deviation of very large sample sizes
$\begingroup$ The computation for standard deviation can be unstable, most especially for sample sizes as large as the OP's since if the data's variance is small relative to the sizes of …
statistics - Find sample size given standard deviation, sample mean ...
2019年12月27日 · Assume that the population standard deviation is $5$ cl. A sample of 100 bottles yields to an average of $48$ cl. Calculate a $90\%$ and $95\%$ confidence interval for …
probability - Estimating population standard deviation with sample ...
2015年5月18日 · At 4:30 of this video the author decided to estimate the standard deviation of the population with sample standard deviation (sample size was $100$). In the next video, the …
sample standard deviation given population standard deviation
2016年5月23日 · In order to "get the sample standard deviation," you need to specify a sample (a subset of the population). If you do not specify a sample, then you cannot get the sample …
How do I combine standard deviations of two groups?
2018年10月26日 · This is the formula for the 'pooled standard deviation' in a pooled 2-sample t test. If we may have two samples from populations with different means, this is a reasonable …
How to compute standard deviation of difference between two …
$\begingroup$ In general it would be s1^2 +s2^2 -2 Cov(m1, m2) where s1 is the sample standard deviation from the sample from population 1 and s2 is the sample standard deviation from the …
How Can I calculate the standard deviation of a yes/no question?
2020年11月29日 · The formula you cite is for the standard deviation of the ... to find the sample standard deviation. The ...
Calculating sample size with standard deviation ... - Cross Validated
2020年1月17日 · Domino’s Pizza in Big Rapids, Michigan, advertises that they deliver your pizza within 15 minutes of placing an order or it is free. A sample of 25 customers is selected at …