Примери за използване на Sample standard на Английски и техните преводи на Български
{-}
-
Colloquial
-
Official
-
Medicine
-
Ecclesiastic
-
Ecclesiastic
-
Computer
Sample standard deviation is 1.04.
So that is our sample standard deviation.
So if this can be estimated it's going to be estimated by the sample standard deviation.
So my sample standard deviation is 0.50.
What's going to be our sample standard deviation?
The sample standard deviation of group two squared.
But we could estimate it with our sample standard deviation.
This gave us the sample standard deviation, it is our best estimator for this.
But we were able to estimate it with the sample standard deviation.
If omitted, the sample standard deviation is used.
So what we're going to do is estimate it with our sample standard deviation.
And so then the sample standard deviation is just going to be the square root of that.
And then you can also calculate your sample standard deviation.
My sample standard deviation is just going to be the square root of my sample variance.
And if I want to figure out my sample standard deviation I just take the square root of that.
And the standard deviation of these 10 data points right here is 2.98, the sample standard deviation.
If you take your sample standard deviation, 4.67 and you square it, you get your sample variance.
If there are fewer than three data points, or the sample standard deviation is zero, SKEW.
Find the square distance from each of these points to your sample mean, add them up, divide by n minus 1, because it's a sample, then take the square root,and you get your sample standard deviation.
If you were to take the square root of that our actual sample standard deviation is going to be, let's take the square root of that answer right over there, and we get 0.496 is equal to 0.
So we have been estimating the true standard deviation of the population with our sample standard deviation.
So let me just write the numerator over again---- we estimate this using our sample standard deviation--- let me do this in a new color-- with using our sample standard deviation.
And this t-table assumes that you are approximating that standard deviation using your sample standard deviation.
If you will have more than 30 samples, if your sample size is more than 30, your sample standard deviation is going to be a good approximator for your population standard deviation.
And when you don't know anything about the population distribution,the thing that we have been doing from the get-go is estimating that character with our sample standard deviation.
We have our sample mean and our sample standard deviation, our sample mean here is 17.17-- figured that out in the last video, just add these up, divide by 10-- and our sample standard deviation here is 2.98.
The mean of the 100 injected rats response times is 1.05 seconds with the sample standard deviation of 0.5 seconds.
So we could say that this is going to be approximately equal to our sample standard deviation divided by the square root of 100, which is going to be equal to our sample standard deviation is 0.5, 0.5 seconds, and we want to divide that by square root of 100 is 10.
This is going to be approximately equal to our sample distribution or sample standard deviation, which we got to be 40.
So the standard deviation of our sampling distribution is going to be-- and we will put a little hat over it to show that we approximated it with-- we approximated the population standard deviation with the sample standard deviation.