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The standard deviation of the population. the standard deviation of the population.
Yes
No.
The true / real standard deviation ("the mean deviation from the mean so to say") which is present in the population (everyone / everything you want to describe when you draw conclusions)
normal distribution
The standard deviation of the population. the standard deviation of the population.
68.2%
The standard deviation if the data is a sample from a population is 7.7115; if it is the population the standard deviation is 7.0396.
Yes
No.
the sample standard deviation
It can be.
Not a lot. After all, the sample sd is an estimate for the population sd.
If the samples are drawn frm a normal population, when the population standard deviation is unknown and estimated by the sample standard deviation, the sampling distribution of the sample means follow a t-distribution.
Yes.
If the population standard deviation is sigma, then the estimate for the sample standard error for a sample of size n, is s = sigma*sqrt[n/(n-1)]
The true / real standard deviation ("the mean deviation from the mean so to say") which is present in the population (everyone / everything you want to describe when you draw conclusions)