HSC Stuff > HSC Standard Mathematics
Standard Math Q+A Thread
LoneWolf:
Hey People,
Just a quicky.
Should i use 'sample' or 'population' standard deviation when they just ask for 'standard deviation'?
Also, it may be beneficial if some1 could tell me the difference!
Thanks everybody
RuiAce:
--- Quote from: LoneWolf on January 07, 2020, 08:07:17 am ---Hey People,
Just a quicky.
Should i use 'sample' or 'population' standard deviation when they just ask for 'standard deviation'?
Also, it may be beneficial if some1 could tell me the difference!
Thanks everybody
--- End quote ---
The difference is really in what a sample is. The population standard deviation is the actual standard deviation. 'Population' refers to every object that you have.
A 'sample' is when you take only some of the objects out of the entire population. It's important because, in practice statisticians are not going to be able to survey everyone in the population. Only a small bunch will respond, and they are the sample. But the sample has to be used to deduce all statistical conclusions.
The sample standard deviation is used when you're interested in the SD of a sample. (In the real world, it's used to estimate the population standard deviation.)
I asked the standard math team and they've told me that generally you should use the population SD. Presumably, this would be because you're usually given information about the entire population. Or at the very least, from my understanding, you should assume that's the case when you're given no further info.
LoneWolf:
Ripper thanks RuiAce
So helpful to have another POC when your school teacher doesnt respond ;D
LoneWolf:
Hello People,
Does anyone know how to activate the pearsons correlation coefficient mode on a CASIO fx-82AU PLUS II?
LoneWolf:
Have since worked it out.
1. Turn on right stat mode
- Mode, 2:stat, 2:A+BCX
2. Enter Data (independent variable x-axis)
- Enter data, AC.
3. Extract Data
- Shift, 1:Stat, 5:Reg, 3:r
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