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March 29, 2024, 06:03:13 am

Author Topic: VCE General & Further Maths Question Thread!  (Read 750330 times)  Share 

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Lucho23

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Re: VCE Further Maths Question Thread!
« Reply #30 on: March 16, 2013, 03:43:03 pm »
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Hey,

Can you please explain clearly how to identify and what is a seasonalised and cyclic trend? I sort of get it, but I'm still a bit confused.
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Daenerys Targaryen

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Re: VCE Further Maths Question Thread!
« Reply #31 on: March 16, 2013, 04:28:34 pm »
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For seasonal, it reappears every Q4. Therefore if there is a max at Q1, then a max will occur at each Q4 after. Eg. Q1, Q5, Q9
Cyclic has peaks etc but it doesnt always follow the same pattern.
An example a teacher use to tell us was:
Seasonal- ice cream sales; they would peak during summer
cyclic; apple company; they release a product, lots of people buy it, they wait until there are less sales, then release their next product
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Yacoubb

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Re: VCE Further Maths Question Thread!
« Reply #32 on: March 16, 2013, 05:12:47 pm »
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For seasonal, it reappears every Q4. Therefore if there is a max at Q1, then a max will occur at each Q4 after. Eg. Q1, Q5, Q9
Cyclic has peaks etc but it doesnt always follow the same pattern.
An example a teacher use to tell us was:
Seasonal- ice cream sales; they would peak during summer
cyclic; apple company; they release a product, lots of people buy it, they wait until there are less sales, then release their next product

Does it have to be every Q4? Because if you were investigating a 36-month period, it could be at every 12th month, or, end of every year, a trough would exist..

Daenerys Targaryen

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Re: VCE Further Maths Question Thread!
« Reply #33 on: March 16, 2013, 05:14:13 pm »
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Well as long as it reoccurs at the same period
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Yacoubb

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Re: VCE Further Maths Question Thread!
« Reply #34 on: March 16, 2013, 05:18:44 pm »
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Well as long as it reoccurs at the same period

Yeah I thought so :) Thanks for the clarification. Luckily my school has divided the core into 3 SACS

Sac 1 - Univariate Data
Sac 2 - Regression + Data Transformations
Sac 3 - Time Series

:) Makes the workload so much easier in terms of studying for the SAC. Then again, the modules aren't exactly long + so its best to do them in that form.

Daenerys Targaryen

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Re: VCE Further Maths Question Thread!
« Reply #35 on: March 16, 2013, 05:22:17 pm »
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Wow thats soo much better!!
I had to do it all within 1 week class time. Was one massive SAC.
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Yacoubb

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Re: VCE Further Maths Question Thread!
« Reply #36 on: March 16, 2013, 07:49:00 pm »
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Wow thats soo much better!!
I had to do it all within 1 week class time. Was one massive SAC.

I guess it alleviates the stress, especially because I'm doing 2 3/4s and I can focus on little bits rather than a whole chunk!

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Re: VCE Further Maths Question Thread!
« Reply #37 on: March 16, 2013, 08:29:09 pm »
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For seasonal, it reappears every Q4. Therefore if there is a max at Q1, then a max will occur at each Q4 after. Eg. Q1, Q5, Q9
Cyclic has peaks etc but it doesnt always follow the same pattern.
An example a teacher use to tell us was:
Seasonal- ice cream sales; they would peak during summer
cyclic; apple company; they release a product, lots of people buy it, they wait until there are less sales, then release their next product

Does it have to be every Q4? Because if you were investigating a 36-month period, it could be at every 12th month, or, end of every year, a trough would exist..

I don't think either of these would get you the mark in the exams. :|

The main difference between a seasonal and a cyclic trend is that in a seasonal trend, the repetition is constant and the 'cycle' is less than one year in duration. Cyclic trends are generally more varied and are more than one year in duration.
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abcdqdxD

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Re: VCE Further Maths Question Thread!
« Reply #38 on: March 17, 2013, 10:23:17 pm »
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Can someone explain the sliding line technique? After reading past posts, I'm still confused about how to do it :(

How would you do it for the objective function Z=60x+100y?

Lucho23

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Re: VCE Further Maths Question Thread!
« Reply #39 on: March 18, 2013, 09:40:47 pm »
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The main difference between a seasonal and a cyclic trend is that in a seasonal trend, the repetition is constant and the 'cycle' is less than one year in duration. Cyclic trends are generally more varied and are more than one year in duration.

Thanks a lot! That's what it says in our book (Essential Maths Cambridge) but my teacher sort of confused me as to how to identify and distinguish the two. This is what I initially thought it was, but I though there may be different attributes these variations would possess. Thanks heaps!
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abcdqdxD

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Re: VCE Further Maths Question Thread!
« Reply #40 on: March 19, 2013, 06:47:23 pm »
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What's the difference between bar charts and frequency histograms?

Daenerys Targaryen

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Re: VCE Further Maths Question Thread!
« Reply #41 on: March 19, 2013, 06:52:41 pm »
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Bar charts are seperated. Each bar is separated, where as histograms are all touching each other, there is no break
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abcdqdxD

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Re: VCE Further Maths Question Thread!
« Reply #42 on: March 19, 2013, 06:55:55 pm »
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Any other differences?

Yacoubb

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Re: VCE Further Maths Question Thread!
« Reply #43 on: March 19, 2013, 07:09:47 pm »
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Any other differences?

Bar Charts are used to display univariate categorical data, whereas Histograms are used to display univariate numerical data, when you have over 40 data values you are working with. :)

Remember, the golden rule for univariate, numerical data
If the n value is greater than or equal to 40, use a histogram.
If the n value is less than or equal to 50, use a stem plot
If the n value is less than or equal to 20, use a dot plot.

abcdqdxD

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Re: VCE Further Maths Question Thread!
« Reply #44 on: March 19, 2013, 07:30:11 pm »
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cheers :D