Advanced Maths Predictions (1 Viewer)

[MJRey]

^^^^^^^^^^

 

[cossine]

^^^^^^^^^^

Predictions are not good for math. Study all the content in the syllabus.

 

[MJRey]

I just meant cause of what they did last year with the huge amount of statistics questions. I hope it's more balanced this year.

 

[d1zzyohs]

I just meant cause of what they did last year with the huge amount of statistics questions. I hope it's more balanced this year.

I would prepare for stats. It wasn't just last year, the new syllabus has an emphasis on stats all the way till 2020. There's been a trend, and I wouldn't be surprised if theres a lot of stats questions this year too.

Stats are easy - when I did my hsc though, we didnt expect it so noone was fully prepared. Abstract statistics proofs using expected value,variance etc. should be covered in your revision (refer to last years last question... i didn't get it out)

 

[notme123]

The math papers usually leak early would anyone happen to find them and post it here?

 

[MJRey]

The math papers usually leak early would anyone happen to find them and post it here?

I haven't seen it around yet. But today's paper was pretty fair. There were a few hard questions, but apart from that the majority of it was doable.

 

[Nezuko----]

I almost had a heart attack in the exam the examiner was like “ times up “ 2 hours and a half into the exam!! But it was for standard. Lol, but the exam was doable some questions really got ya thinking tho

 

[George2004]

That shit sucked

 

[saltshaker]

i cant believe they made us write a 4 mark essay for stats </3

otherwise it was fine

 

[notme123]

Im doing the paper now and just did the 'essay' question. I talked about 3 things: 1 the correlation coefficient being positive, the range of actor ages and extrapolation for younger years there's probably more to talk about.

 

[Life'sHard]

Im doing the paper now and just did the 'essay' question. I talked about 3 things: 1 the correlation coefficient being positive, the range of actor ages and extrapolation for younger years there's probably more to talk about.

Got nothing better to do in flex week Lol.

 

[Siwel]

Seems like there is less stats this time?

 

[notme123]

Got nothing better to do in flex week Lol.

Dont judge hahaha.
I have an assignment due Monday for comp which I've finished and don't want to do econ work rn.

 

[Gtsh]

Shouldn't it be 1/6

 

[Nezuko----]

yeah I think thats wrong.

I think Q15 is wrong, not sure why its 1/5?

 

[sneak11]

i feel like he made a couple other mistakes too (for instance on the integration of the hyperbola) and also on the final where he left out the .16

 

[jackmccowan]

I think Q15 is wrong, not sure why its 1/5?

It should be 5/18

 

[PCNQQn2]

I looked at the 3 sets of solutions posted for discrepancies, and also looked at mine.
* Q15: I got 5/18 for 15a and 3/5 for 15b, which is different to two sets of solutions posted. I have verified both with 500,000 trials in a spreadsheet.
* Q28c I agree with John Drake's answer: 2ln2-3/2+pi/4
* Q32c should be $931.54 (also verified with a spreadsheet)
* For Q24, my answer is (emphasis on with reference to the context given).

• there is a positive correlation (r>0), meaning that as the age of characters increases, so does the age of the actors
• r=0.4564 means a moderate strength of the correlation. i.e. if the equation of the line of best fit was used for interpolation, it wouldn't be too reliable. For example, for a character of age 15, the equation suggests an actor age of 20. But the graph shows there is a lot of variation for 15 year old characters (14 to 27 years)
• gradient of 1.85 means that on average, for every extra year of character age, actor age increases by 1.85 years
• extrapolation would not be reliable given there is not data for <14 and >17 years for character age, and the study was for teenage characters only.

 

[chilli 412]

I looked at the 3 sets of solutions posted for discrepancies, and also looked at mine.
* Q15: I got 5/18 for 15a and 3/5 for 15b, which is different to two sets of solutions posted. I have verified 5/18 with 100,000 trials in a spreadsheet.
* Q28c I agree with John Drake's answer: 2ln2-3/2+pi/4
* Q32c should be $931.54 (also verified with a spreadsheet)
* For Q24, my answer is (emphasis on with reference to the context given).

• there is a positive correlation (r>0), meaning that as the age of characters increases, so does the age of the actors
• r=0.4564 means a moderate strength of the correlation. i.e. if the equation of the line of best fit was used for interpolation, it wouldn't be too reliable. For example, for a character of age 15, the equation suggests an actor age of 20. But the graph shows there is a lot of variation for 15 year old characters (14 to 27 years)
• gradient of 1.85 means that on average, for every extra year of character age, actor age increases by 1.85 years
• extrapolation would not be reliable given there is not data for <14 and >17 years for character age, and the study was for teenage characters only.

 

[PCNQQn2]

Is it wrong to say that there is a positive skew in the data whereby there's a larger concentration of actors aged 14-15?

I don't think there is a point to be made based on skew.
Considering characters, there are 18 of them aged 14-15, and 15 of them aged 17-18.
Considering actors, there are fewer at both ends (below 18 yrs, and above 26 yrs), and more in the middle.