VCE General & Further Maths Question Thread!

[Green]

when you smooth data for example exam 1 2006 question
use 2 point smoothing moving mean
 do you suppose take values each side of 2006 or do you take 2007 and 2008?

[Patches]

For 2006, you'd get the mean of 2005 and 2006, and the mean of 2006 and 2007.
Then find the mean of those two means for the value for 2006.

[Green]

say i was doong it for medium do i the same?

[Zealous]

And there was one question with seasonal index 0.8, to correct for seasonality
(D) increase by 20%
(E) increase by 25%

Answer is E. How?!

1/0.8 = 1.25 Therefore 25% increase.

There is a big difference between dividing by 0.8 and multiplying by 1.2.

[Green]

Trouble smoothing median question 4 please explain?

[lala1911]

Trouble smoothing median question 4 please explain?

Question 4 is about a time series plot.
Question 6 is about the median. What I did was:

Since it's about time period 5, you are going to want the mean from 4,5,6,7 which is 25 and 3,4,5,6 which is 19.5. To smooth them, 25+19.5 / 2 = 22.25 = C

You get the median from 2 values behind the time period and 1 value behind the time period.

[Green]

thanks, but why do you use 2 behind and one above? since it is say median why do you.use mean smoothing?

[lala1911]

thanks, but why do you use 2 behind and one above? since it is say median why do you.use mean smoothing?

I did it from 1 below and 2 below.
I used the median.
Median of 95,0,31,8 is 19.5
Median of 0,31,8,19 is 25
= 22.25

[sjayne]

for the vcaa 2012 exam 2 how do you do question 1dii?
The answer divides 168 by 6 which equals 28 months and then uses the sum equation.
My question is, why is it 168/6? Thanks.

[BLACKCATT]

As the common difference is -6, thus it can only reduce by 6 a certain amount of times until it reaches 0.

[sjayne]

aaah that makes sense!! Thank you

[lala1911]

Yeah, when you see after 18 months you should immediately think total. So its pretty much the total minus the 18 months and that's what has not been sold yet.

[duhherro]

And for VCAA 2011 Ex 1 Networks,
Q7)
Is the question just asking how much can the person talk without actually interfering with the main job (critical path)?


could anyone explain to me the answer for networks on Q4 c of 2011 exam 2 vcaa? A bit question on what it wants me to do...



And for minimum monthly balances, lets say you have a bank statement over more than just one month, when you need to calculate the interest earned at each month, the smallest principal amount carries over into the next month right ? So you use that value twice again?


Thanks!

[nikeets]

In networks, when there are loops, it equals 1 from say A to A (point A has the loop), not 2? There was confusion with this at school. Thanks! 

[lala1911]

In networks, when there are loops, it equals 1 from say A to A (point A has the loop), not 2? There was confusion with this at school. Thanks! 

A loop in an adjacency matrix is recorded as 1!