ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: Hodgeyhodgey on January 05, 2011, 12:45:43 pm

Title: Standard Deviation
Post by: Hodgeyhodgey on January 05, 2011, 12:45:43 pm

I've been running through the first term's work in further and despite being quite simplistic, does anyone have a quicker method of calculating the standard deviation rather than drawing up the table as it suggests in the textbook?

I know it's easy, but I'm afraid that doing a number of these tables on sacs/exams will be quite time consuming..

Title: Re: Standard Deviation
Post by: AccFur on January 05, 2011, 12:52:53 pm

use your CAS calculator
go to stats lists - enter it in l1,l2 depending on how many variables you have
f4 - calc
1-var stats or 2-var stats depending on how many variables you have

and thats it! quick and easy.

that was for the TI-89, not sure about other CAS

Title: Re: Standard Deviation
Post by: Hodgeyhodgey on January 05, 2011, 01:09:31 pm

Quote from: AccFur on January 05, 2011, 12:52:53 pm

use your CAS calculator
go to stats lists - enter it in l1,l2 depending on how many variables you have
f4 - calc
1-var stats or 2-var stats depending on how many variables you have

and thats it! quick and easy.

that was for the TI-89, not sure about other CAS

sorry, should've mentioned i want a quicker way of doing it by hand :/

my bad, but thanks for the help! i'll remember that for when i need to do it by calculator :)

Title: Re: Standard Deviation
Post by: Russ on January 05, 2011, 01:34:41 pm

There's no fast way to calculate standard deviation by hand if all you have is a list of values. You just have to add them all up and calculate unfortunately :(

Title: Re: Standard Deviation
Post by: lexitu on January 05, 2011, 01:37:33 pm

Further Maths is a lot about accepting the ease of using the calculator and ignoring any self-pride. In most cases, such as this one, the quickest way is with the calculator.

Title: Re: Standard Deviation
Post by: Greatness on January 05, 2011, 01:46:10 pm

Quote from: lexitu on January 05, 2011, 01:37:33 pm

Further Maths is a lot about accepting the ease of using the calculator and ignoring any self-pride. In most cases, such as this one, the quickest way is with the calculator.

+1 You will use your CAS A LOT in further especially for the core section. The more you practice using it, the better you will get. And you will use your calculator for almost all calculations in the exam.

Title: Re: Standard Deviation
Post by: Hodgeyhodgey on January 05, 2011, 03:47:05 pm

Damn, guess I'm stuck using this tedious method :(
Although I'm having quite a bit of fun with the 68-95-99.7% rule, it's so easy!! :D

Title: Re: Standard Deviation
Post by: sam.utute on January 05, 2011, 10:56:48 pm

Quote from: lexitu on January 05, 2011, 01:37:33 pm

Further Maths is a lot about accepting the ease of using the calculator and ignoring any self-pride. In most cases, such as this one, the quickest way is with the calculator.

+1 As mentioned previously, just use your calculator. Both exams can be easily completed with no working out on your calculator.