VCE General & Further Maths Question Thread!

[Dan1995]

What SS can I get for:
SAC: 99.7/100 (Rank 1) (Average cohort about 80people)
Exam 1: 38/40
Exam 2: 57/60

Please note there is a separate thread dedicated to this in the exam discussion forum.

I'd say mid/low 40's

[AirLandBus]

Can anyone confirm wether or not the values of 58 and 60 are outliers or not. The textbook says they are but i dont think they as the upper fence is 61, thus there inside it and not considered outliers.

[keltingmeith]

Can anyone confirm wether or not the values of 58 and 60 are outliers or not. The textbook says they are but i dont think they as the upper fence is 61, thus there inside it and not considered outliers.

Is there any other information for this question?

[AirLandBus]

Is there any other information for this question?

Yep. This bad boy.

[keltingmeith]

Only explanation I can come up with is that we can estimate the standard deviation to be approximately 5 or 7.5, and those data points fall further than 2 standard deviations away from the mean.

However, this method of approximated is not in the study design, and the 2 standard deviation (while mentioned in Heinemann...) is ALSO not mentioned in the study design as a way of finding outliers. So, I think your book's made an oopsie, as I can confirm you're using the IQR method properly to find the upper bound.

[StupidProdigy]

Can someone please explain how to do part viii of this question!?

[keltingmeith]

Can someone please explain how to do part viii of this question!?

A nice logic question. If you aren't familiar with the 68-95-99.7% rule, refer to this picture. You'll see that 95% of values fall between two standard deviations of the mean, and so 5% are outside those two standard deviations. By symmetry, we know that either "tail-end" should have 2.5% each. Now, we want to know the score such that 97.5% will score higher than it - so we need to start counting from those tail ends. So, we start with the 2.5% after 3 standard deviations. Then, we add the 95% from the above diagram, and we'll get 97.5% (alternatively, you could've added each segment - ie, gone to +1 sd, then 0, -1sd, -2sd).

So, 97.5% of people will score ABOVE 2 sd below the mean, which is 100-2(15)=100-30=70.

[cosine]

omfg eulerfan, you're HERE aswell........ everywhere i go! 

[StupidProdigy]

A nice logic question. If you aren't familiar with the 68-95-99.7% rule, refer to this picture. You'll see that 95% of values fall between two standard deviations of the mean, and so 5% are outside those two standard deviations. By symmetry, we know that either "tail-end" should have 2.5% each. Now, we want to know the score such that 97.5% will score higher than it - so we need to start counting from those tail ends. So, we start with the 2.5% after 3 standard deviations. Then, we add the 95% from the above diagram, and we'll get 97.5% (alternatively, you could've added each segment - ie, gone to +1 sd, then 0, -1sd, -2sd).

So, 97.5% of people will score ABOVE 2 sd below the mean, which is 100-2(15)=100-30=70.

Left the question for a while and came back to it....omg I can't believe how simple the question was yet I didn't get it haha! Thanks heaps for the explanation as well EulerFan!

[keltingmeith]

omfg eulerfan, you're HERE aswell........ everywhere i go! 

[StupidProdigy]

Hey can someone please show me where they get the seasonal index of 1.30 from in part 2 of example 12. Background info to the question is in the other attachment. Thanks!

[Mellyboo]

Hey can someone please show me where they get the seasonal index of 1.30 from in part 2 of example 12. Background info to the question is in the other attachment. Thanks!

Hey there, looks like you need more information, perhaps before example 11.

[belle123]

This may seem like a stupid question but, for the bound reference, can i use a book with a spiral spine if it does not have perforated pages??

Just want to make sure I'm doing it right from the start

Thanks 

[Mellyboo]

This may seem like a stupid question but, for the bound reference, can i use a book with a spiral spine if it does not have perforated pages??

Just want to make sure I'm doing it right from the start

Thanks 

Yes!

[keltingmeith]

This may seem like a stupid question but, for the bound reference, can i use a book with a spiral spine if it does not have perforated pages??

Just want to make sure I'm doing it right from the start

Thanks 

Yep - you could use a bunch of A4 pages held together by some intense duct-taping if you wanted. As long as it has a single spine, is of A4 size or smaller and the binding is permanent, you're fine.