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University Statistics Discussion Marathon Expand the square and note that the mean (and also its square) is a constant. In the second summand there is a common factor which can be factorised out. In the third summand note that you are summing the same constant value n times.

This question is quite advanced for first year level lol

Use the substitution z=\dfrac{x-\mu}{\sigma} noting that \sigma>0 E|X-\mu|=\dfrac{1}{\sigma\sqrt{2\pi}}\displaystyle\int_{-\infty}^{\infty}|x-\mu|e^{-\frac{1}{2}\left(\frac{x-\mu}{\sigma}\right)^2}\,dx\\\\ =...

Another approach would be to note that this equation is equivalent to sin 3x = sin(-x) If you solve it within one 'revolution' (like you would for a standard trig equation) you get 3x = -x or 3x = π - (-x) Now generalise this to multiple 'revolutions' 3x = -x + 2πn or 3x =...

The Black Scholes model used to price some financial securities is based on the heat equation derived from Physics. Some of the more advanced models (i.e. ones you will never see at uni unless you are exposed to forefront academic literature) attempt to use chaos theory (which is a Physics...

More emphasis on communication and language for starters as well as how to compose a variety of text types with greater levels of sophistication (rather than excessive focus on writing narratives and essays). Leave the literature stuff to more advanced or extension levels. lolwut

I personally think English shouldn't be compulsory unless they change the course completely to focus on stuff that is more applicable to real life

Doing a 'simple' but thought heavy maths question is a great test to see how sobered up you are after drinking

I don't think making maths compulsory at HSC level will change attitudes at all tbh. I mean look at English as an example of a compulsory subject and how many people still hate it (including me). I also think an education degree is still necessary to become a proper teacher. Just because you...

Without going into technical details, a subject scales well if it contains students from the higher end of the total HSC population. A subject scales badly if it contains students from the lower end of the total HSC population. Compulsory subjects like English Standard/Advanced have virtually...

You do realise that if you make a subject compulsory then its scaling becomes worse...LOL

Then that means we should make extension 1 and 2 english compulsory to all students no matter what. Then there would be no point calling it extension 1 and 2 at all if everyone is doing it lol

Re: USYD Chatter Thread - Semester 1 2016 Isn't ECON1001 a pre-req for that?

University Statistics Discussion Marathon The p-value is the probability of an observation occurring assuming the null hypothesis is actually true. If the p-value is very low then the observation you see is very unlikely if the null hypothesis is true. If you believe the observation you see is...

You won't get it unless you actually studied stats at uni. Alternatively, google is your friend.

See BoS trials kthanxbye

ftfy

I honestly think these 'changes' are more like corrections of the obvious flaws in the original scheme. The fact that you pay the base price of $2 each time you switch modes of transport is pretty bad in the first place. In theory the price should correlate with distance travelled so the...

Re: USYD Chatter Thread - Semester 1 2016 You get two certificates

$200 fine each trip? lol