Random samples

[Jeterion85]

We were learning in class about sample distribution.My teacher showed in class that a random sample from a population with mean μ and variance σ² is like
Sample1 [x11,x12 ,..,x1n]
Sample2 [x21,x22,...,x2n]
.
.
.
Samplen [xn1,xn2,....,xnn]

But on the internet, all I found was like this
Sample [x1,x2,...,xn]

Which is correct in terms of sample distribution?
Thank you!

 

[tkhunny]

Teacher and Internet appear to be using identical notation.

The internet version selected only one sample and required no additional index to distinguish multiple samples.

Sample1 [x11,x12 ,..,x1n]
Sample2 [x21,x22,...,x2n]

 

[Jeterion85]

Teacher and Internet appear to be using identical notation.

The internet version selected only one sample and required no additional index to distinguish multiple samples.

Sample1 [x11,x12 ,..,x1n]
Sample2 [x21,x22,...,x2n]

So my random sample can have more than 1 to many samples, or i have to take samples as the size of each sample?

 

[HallsofIvy]

I don't know what you mean by "take samples as the size of each sample". Your teacher is taking "n" samples while the internet example has just one sample. If you are asking if each sample in a group of samples has to have the same size, technically, no, but taking them all of the same size simplifies the calculations.