• Best of luck to the class of 2025 for their HSC exams. You got this!
    Let us know your thoughts on the HSC exams here

Class of 2025 (2025 HSC CHAT) (52 Viewers)

parmesean

Well-Known Member
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

Well-Known Member
Joined
Jul 1, 2025
Messages
1,206
Gender
Male
HSC
2025
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

Well-Known Member
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

Well-Known Member
Joined
Jul 1, 2025
Messages
1,206
Gender
Male
HSC
2025
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
 

gossipgirllll

Well-Known Member
Joined
Feb 25, 2025
Messages
831
Location
bye
Gender
Female
HSC
2025
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
 

parmesean

Well-Known Member
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
they do, if you forget a square or smth early in your work but go on to use all the right working to achieve an answer, then you wont lose more than 2 for that question
 

parmesean

Well-Known Member
IM DEAD I HAD TO CATCH UP ON ALL THE MESSAGES YALL BE TOO FUNNY 😭😭 THE ONLY PART ABOUT HSC ILL MISS IS BOS BRUH
i just read back through the time i left last night andthefirst thing i see is lolcti saying she wishes she could transmit an sti to me so i suffer
1761182360157.png
 

Users Who Are Viewing This Thread (Users: 14, Guests: 38)

Top