VCE General & Further Maths Question Thread!

[EdwinaB19]

What's the most reliable way of distinguishing between a random fluctuation and seasonality when analysing a time series?

[Mattjbr2]

Hey guys, I can't seem to understand why that's the answer. Why is my answer unacceptable?

[Sine]

Hey guys, I can't seem to understand why that's the answer. Why is my answer unacceptable?

I've never done further but i'll try to help

the first 60 tanks sell for 500
then tank 61,62,63...,150 sell for 700
The end point (60,30000) you have from the 60 tanks should be the start point for the second line (the line where each tank costs 700) You have incorrectly included it on the part (a) line
The answers have this part correct

Then from there the equation will not be 700n since it doesn't start at the origin it starts at the endpoint for the first 60 tanks which is the point (60, 30000) Thus you will have a different equation for the line.

Also I think your position for 60 tanks on the graph is a little off your points there seem to be directly between 50 and 75  (i.e. 62.5) so try to make it clear that it isn't directly between 50 and 75 placing it a little to the left.

[Mattjbr2]

I've never done further but i'll try to help

the first 60 tanks sell for 500
then tank 61,62,63...,150 sell for 700
The end point (60,30000) you have from the 60 tanks should be the start point for the second line (the line where each tank costs 700) You have incorrectly included it on the part (a) line
The answers have this part correct

Then from there the equation will not be 700n since it doesn't start at the origin it starts at the endpoint for the first 60 tanks which is the point (60, 30000) Thus you will have a different equation for the line.

Also I think your position for 60 tanks on the graph is a little off your points there seem to be directly between 50 and 75  (i.e. 62.5) so try to make it clear that it isn't directly between 50 and 75 placing it a little to the left.

Why must the new graph begin where the previous one left off? Can't this just be a type of step graph? Or can step graphs only ever be horizontal and angled graphs must always connect?

[Mattjbr2]

Also, for part d. How can the effective interest rate possibly be what Neap claim in their solutions? Shouldn't it be 12.97 ? Neither the book nor the formula sheet have the formula that Neap use. Should I mark this as correct or incorrect?

[Sine]

Why must the new graph begin where the previous one left off? Can't this just be a type of step graph? Or can step graphs only ever be horizontal and angled graphs must always connect?

Think of it logically if the cost goes to X and then you continue selling the cost can't magically jump an extra 1000$ right? This is just one situation here were they sell 60 tanks for some cost and then continue selling tanks at a different cost.

[Maya24]

When doing the VCCA practice exams from their past study design, is it recommended to do number patterns as well?

[zofromuxo]

When doing the VCCA practice exams from their past study design, is it recommended to do number patterns as well?

Yes. Most of the questions should be relevant to the current study design as well.

[Maya24]

Thank you

[Mariamnourine]

Hey guys,

Just got an email sent to me by one of my classmates and I thought it would be really useful for all you guys as well.

So if you hop on to this website: http://vicmathsnotes.weebly.com/year-12-further-maths.html, You will find all the relevant practice exam questions [for EVERY module] for a specific area you struggle in, for example, there is a subheading for 'Matrix multiplication', and when you click on it it provides you with ALL the relevant VCAA questions in this area!!

Pretty cool, yeah?

Let me know if you're having trouble finding them and I'll talk you through it step-by-step [shouldn't be a challenge though!]

Enjoy and happy studying! 

[Mariamnourine]

What's the most reliable way of distinguishing between a random fluctuation and seasonality when analysing a time series?

Well here it goes:

Random fluctuation- doesn't have a time period, so it can fluctuate at 6 months, then again at 8 months, then at 11 months [there is no pattern]

Seasonality- usually fluctuates over 4 quarters, so every 3 months it'll fluctuate. Try breaking up the plot into 3 month intervals, if all 4 intervals seem the same, its seasonality, if not, then they are random fluctuations.

feel free to ask for clarifications!

[Mattjbr2]

Think of it logically if the cost goes to X and then you continue selling the cost can't magically jump an extra 1000$ right? This is just one situation here were they sell 60 tanks for some cost and then continue selling tanks at a different cost.

Ahh I see. Thanks!
What about that effective interest rate thing? I just completed another Neap prac exam (2008, 1) and again I used the formula sheet/textbook's methods while Neap used their own method to get totally different answers. Who's correct here? Neap claims the effective interest rate is like twice the normal interest rate!
The question states: $500 item under a hire-purchase agreement. A 10% deposit is paid. Then $23/month is paid for 2 years. The effective interest rate is:... I calculated it to be r=11.33%-->reff=11.94% (which is not an option), but Neap say it's 21.8%. Who's right here?

[Creamysnow]

Can someone help me with this question?

Thanks

[Nicko912]

Can anyone figure these financial ones out? I get a different answer on financial solver compared to when I use equations (not sure why).

Thanks

[Mariamnourine]

Can anyone figure these financial ones out? I get a different answer on financial solver compared to when I use equations (not sure why).

Thanks

I'll help you solve them out once I get the answers for these- to avoid intimidation because I'm also in year 12. In relation to getting a different answer, it's talking about repayments, so you need to use finance solver