Class of 2025 (2025 HSC CHAT) (13 Viewers)

[yourbestfriend]

ikrrr like i swear to honest god, im just praying at this point to get okay marks. i lowkey walked past some nsghs and nsbhs kids yesterday and rlly wanted to ask how they found the test lololol

ahahaha probably for the best that you didn't. they probably would've said it was 'the easiest thing ever'
like math was my 'fun and easy' subject but yesterday proved that it clearly wasnt

 

[svad]

Based on that guy's answers

omg where can I find this

 

[bigupsanky]

omg where can I find this

dont look at it is a heartbreaking sight

 

[yourbestfriend]

omg where can I find this

its on the math adv predictions/thoughts page but trust me it causes more harm than good

 

[bigupsanky]

ext 1 ppl do u reckon they can mark us down for minor differences in z scores? like i marked myself down for one of the questions from smarter maths cuz i got a z score of 1.6 whereas the answer got a z score of 1.58

 

[Clai]

my immediate reaction was surely not right? they wont be that petty. but also if u round too early, isnt that also a problem? anywyas i think its a good idea to be strict when ur marking urself just in case bc its better than getting it wrong in the exam

 

[parmesean]

ext 1 ppl do u reckon they can mark us down for minor differences in z scores? like i marked myself down for one of the questions from smarter maths cuz i got a z score of 1.6 whereas the answer got a z score of 1.58

nah they wouldnt mark down for this since 1.58 rounds up to 1.60 you are in an acceptable range of error

 

[bigupsanky]

my immediate reaction was surely not right? they wont be that petty. but also if u round too early, isnt that also a problem? anywyas i think its a good idea to be strict when ur marking urself just in case bc its better than getting it wrong in the exam

yea plus they used like a different formula to mine, though they should give you the same z score in the end. i used the sigma = sqrt(np(1-p)) and E(X) = np one, whereas they used the sample proportion thing

 

[bigupsanky]

nah they wouldnt mark down for this since 1.58 rounds up to 1.60 you are in an acceptable range of error

thats good then. also would you recommend using the sample proportion formula or the normal formula for expected value and standard deviation when the question doesnt explicitly mention one specific thing

 

[svad]

its on the math adv predictions/thoughts page but trust me it causes more harm than good

oh my god you were so right i should've minded my own business

 

[bigupsanky]

oh my god you were so right i should've minded my own business

whatchu get

 

[svad]

whatchu get

idk i didn't add it up. Honestly i don't even remember what i put down for some of my answers so I can't really put together a mark

 

[bigupsanky]

idk i didn't add it up. Honestly i don't even remember what i put down for some of my answers so I can't really put together a mark

fairs

 

[parmesean]

thats good then. also would you recommend using the sample proportion formula or the normal formula for expected value and standard deviation when the question doesnt explicitly mention one specific thing

i thought these were for different types of data, iirc, use the normal formula whenever the data should follow a normal distribution like marks, height, weight, etc. (numerical data)

im pretty sure u only use sample proportion for categorical data (success/fail) within a given population, then examine how far that strays from the expected value

then again i coulda totally forgotten but im pretty sure they are for different scenarios.

 

[bigupsanky]

i thought these were for different types of data, iirc, use the normal formula whenever the data should follow a normal distribution like marks, height, weight, etc. (numerical data)

im pretty sure u only use sample proportion for categorical data (success/fail) within a given population, then examine how far that strays from the expected value

then again i coulda totally forgotten but im pretty sure they are for different scenarios.

ig but i just discovered both of them give u the same result so i was wondering which one was the better formula to use

 

[parmesean]

ig but i just discovered both of them give u the same result so i was wondering which one was the better formula to use

whenever ur given a population / number of trials that is like NOT huge you should use the sample population formula since things act more eratically at low samples

for example if i flip a coin 20 times, theres a very low chance it behaves as a normal distribution, however if i flip it 2,000,000 times then the normal curve will come about,

so in those cases where the normal curve isnt basically guaranteed, i.e youre given a population, number of trials that satisfy

np ≥ 10 and n(1−p) ≥ 10 <--- this is not a math rule this is just a rule of thumb, itll be very clear in the HSC what they want

then u can use sample

 

[bigupsanky]

whenever ur given a population / number of trials that is like NOT huge you should use the sample population formula since things act more eratically at low samples

for example if i flip a coin 20 times, theres a very low chance it behaves as a normal distribution, however if i flip it 2,000,000 times then the normal curve will come about,

so in those cases where the normal curve isnt basically guaranteed, i.e youre given a population, number of trials that satisfy

np ≥ 10 and n(1−p) ≥ 10 <--- this is not a math rule this is just a rule of thumb, itll be very clear in the HSC what they want

then u can use sample

alr bet thanks a lot

 

[Clai]

when the hsc papers give sample answers, r those full mark answers?

 

[gossipgirllll]

do u guys think hsc markers follow ECF within the same question but not part a, b like one question like idk how to explain it but

 

[bigupsanky]

when the hsc papers give sample answers, r those full mark answers?

yea? thats why its a sample answer i think