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Questions tagged [standard-deviation]

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Standard deviation is the square root of the variance of a random variable, an estimator thereof, or a similar measure of the spread of a batch of data.

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I don't understand why the standard error of the mean does not depend on the number of samples of the mean that you take. To clarify, let's use a simplified version of the example in this answer. Two ...
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I have seen this sentence or similar statments many times: The standard deviation is the statistical measure that describes, on average, how far each data point is from the mean. But I thought the ...
Zuriel's user avatar
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My current question is related to a previous post I made on the same topic. I am conducting a meta-analysis and have encountered several publications where, when I attempt to estimate the pre-post ...
marco's user avatar
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1. Definitions The standard error of a statistic is an estimate of the standard deviation of the sampling distribution of that statistic. The sampling probability distribution of a statistic is the ...
okman's user avatar
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The first group has sample size 24 with mean=102.7 The second group has sample size 25 with mean 104.1 P value = 0.83 How to calculate SD for two groups. Thanks for all.
user477904's user avatar
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1 answer
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I have a list of mean values $\mu_i$ that all consist of a variable amount of values $n_i$ and I calculated each mean's corresponding standard deviation $\sigma_i$. I want to calculate the mean value ...
datalung's user avatar
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1 answer
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I am trying to determine whether the variation in a response differs between two treatment groups, I am curious what others think of my current strategy and I have some outstanding questions that I ...
twilightecologist's user avatar
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1 vote
0 answers
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I use this formula to obtain the confidence intervals: ...
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