further questions

[vce01]

eh, i dont want to make a thread for every question i have so im gonna follow the trend applied in other boards...

anyway, i was doing the 04 heffernan exam and for one of the questions it said age was continuous. is that right? i thought continuous meant variables that can be measured. you don't measure age do you? 

[jsimmo]

Age is generally considered to be continuous because you can be 18 and 1/2.. it just keeps going. However, if the question only stated whole numbers then it would be discrete in that context.

[vce01]

hmm ok thanks, its just that in my text book it says continuous variables follow the 'it should be measured' rule and i don't think age is measured....oh well.

[Amnesiac]

I wouldn't think about it in that way. I'd think of it in the way that jsimmo said, purely because its easier and less complicated. Continuous = any number, decimals included (for age you can be 18 years and 2 months old) and Discrete = only whole numbers (such as number of people with red hair lol, cos you can't have 5.1 people or whatever)

It's not meant to be extremely confusing, and there will only be like 3 questions at most relating to it in the exam i think.

[ReVeL]

I wouldn't think about it in that way. I'd think of it in the way that jsimmo said, purely because its easier and less complicated. Continuous = any number, decimals included (for age you can be 18 years and 2 months old) and Discrete = only whole numbers (such as number of people with red hair lol, cos you can't have 5.1 people or whatever)

It's not meant to be extremely confusing, and there will only be like 3 questions at most relating to it in the exam i think.

Totally agree.

Much less confusing than trying to think if it's measured or not.

[vce01]

I wouldn't think about it in that way. I'd think of it in the way that jsimmo said, purely because its easier and less complicated. Continuous = any number, decimals included (for age you can be 18 years and 2 months old) and Discrete = only whole numbers (such as number of people with red hair lol, cos you can't have 5.1 people or whatever)

It's not meant to be extremely confusing, and there will only be like 3 questions at most relating to it in the exam i think.

ohh okay, yeah thats much more easier to understand. my textbook ftl.
thanks (Y)

[BiG DaN]

I wouldn't think about it in that way. I'd think of it in the way that jsimmo said, purely because its easier and less complicated. Continuous = any number, decimals included (for age you can be 18 years and 2 months old) and Discrete = only whole numbers (such as number of people with red hair lol, cos you can't have 5.1 people or whatever)

It's not meant to be extremely confusing, and there will only be like 3 questions at most relating to it in the exam i think.

you could technically have half a head of red hair, or red highlights haha

[ausyid]

Question:

For standard deviation, how do we know when to use the Sx value and when to use the σX value?

[droodles]

because one is used for university statistics stuff and to make it fun, i'll have you guess which one is the uni one and which one is the one we use in the further maths curriculum.

[Noblesse]

Question:

For standard deviation, how do we know when to use the Sx value and when to use the σX value?

Use the Sx value, us delicate further maths students need the reminder 'S' in front of the x to make sure we remember to use it

[Glockmeister]

I think you would use the Sx when refering to the standard deviation of a sample whilst σx would be the standard deviation of a population.

For the purposes of Further Maths, you would always be refering to samples not population.

[ausyid]

Thanks for all the replies.

[clinton_09]

http://www.vcaa.vic.edu.au/vce/studies/mathematics/further/pastexams/02fmexam1.pdf

QUESTION 5 BUSINESS MATHS?

im stumped 

[vce01]

48 repayments of 480 over 4 years = 48 * 480 = 23040

loan is $18000 so interest = 23040 - 18000 = 5040

annual r% = (100 * Interest) / (Principal * Time)

so, (100 * 5040) / (18000 * 4) = 7%

effective interest rate = annual interest rate * [2 (number of repayments) / (# of repayments + 1)]

so, 7 * 96/49 = 13.7%

[jsimmo]

WTF... I hate these questions? !!