'Stupid' Exam Questions

[speedy]

Depends on the marks given in the question - however, since it's a required step for finding the solution, I'd say yes. The way you've done it looks fine - I do it a different way, but we get the same answer, and your method makes intuitive sense. Only thing is that mathematically, your notation is wrong. Instead of writing x in the middle, write (the angle of the circular function).

Oh yeah gotcha, did you learn your method anywhere though? Because I just kind of made up my way, as we were never taught it.

[keltingmeith]

Oh yeah gotcha, did you learn your method anywhere though? Because I just kind of made up my way, as we were never taught it.

Not specifically - teachers demonstrated the question, and we picked up the method intuitively.

So, say we have , and . But, our angle isn't x, it's - so, we slowly apply those transformations:



Which is the new domain we solve the question for. This is a very weird domain to solve for, wouldn't get it on calc free - I just wanted to come up with something very convoluted so you got the way of it.

[speedy]

Ahk, thanks

Also,
Any ideas for formulas/whatever to put on the front page of bound reference - for both specialist and methods?

[Tasmania Jones]

When defining parameters for Standard Normal Distribution questions, can you write either X~N(mean, standard deviation) or X~N(mean, variance) ?
I.e are both correct?

[BLACKCATT]

Omg your username LOL. Sorry off-topic xD

[Zealous]

When defining parameters for Standard Normal Distribution questions, can you write either X~N(mean, standard deviation) or X~N(mean, variance) ?
I.e are both correct?

Nope, the proper notation is . The notation for normal distributions uses the mean and the variance.

[keltingmeith]

When defining parameters for Standard Normal Distribution questions, can you write either X~N(mean, standard deviation) or X~N(mean, variance) ?
I.e are both correct?

Just a slight naming clean-up - the term "Standard Normal Distribution" is actually a specific type of normal distribution, with mean 0 and variance 1. Of course, the square root of 1 is 1, so you could write it in terms of the standard deviation by mistake and still notate it properly. However, for a normal distribution with variance not 1, refer to Zealous' answer.

[Tasmania Jones]

Yeah, I meant Normal Distribution  sorry
Thanks

[GeniDoi]

Great thread EulerFan101 but there are a few errors in it:

Do I need to include units?
You should always include units - make sure to the read the initial information and the question you're on to know what units you're working with, and what units you should report your answer to. They're not always the same.

VCAA do not expect you to include units with any Extended Response questions, both for intermediate steps and final answer. You can even be penalized for including the wrong units, whereas you won't be if you include none at all.

This doesn't mean they can't randomly ask you "What are the units of the answer above", or having a MC question that has 2+ options as the same number but different units (with only one of them being the right answer).

Do I HAVE to give the domain for an inverse function?
As a general rule, you should. However, if they say "find the rule for ", then you HAVE to give it, and in other cases you don't have to unless they also specify the domain. But just to be safe, you should.

If they only ask you to find the rule, you only need to specify the inverse functions equation.
If they ask you for the function, specifying the domain alongside with the rule is required.

[Valyria]

VCAA do not expect you to include units with any Extended Response questions, both for intermediate steps and final answer. You can even be penalized for including the wrong units, whereas you won't be if you include none at all.

Really? I'm not aware of this. Could you provide a source please?

[keltingmeith]

Great thread EulerFan101 but there are a few errors in it:

VCAA do not expect you to include units with any Extended Response questions, both for intermediate steps and final answer. You can even be penalized for including the wrong units, whereas you won't be if you include none at all.

This doesn't mean they can't randomly ask you "What are the units of the answer above", or having a MC question that has 2+ options as the same number but different units (with only one of them being the right answer).

If they only ask you to find the rule, you only need to specify the inverse functions equation.
If they ask you for the function, specifying the domain alongside with the rule is required.

Thanks for the additions - however, I have added an amendment to the second note already, I'll clarify it a bit more though.

On the first note, this is news to me - where did you get this bit of information from?

[Tasmania Jones]

My teacher (who marks Exam 2) also said that units do not have to be included. I don't have any concrete evidence though

[GeniDoi]

I asked several methods teachers from my school because I wasn't sure either, and they all said units aren't required. Also every SAC I've done haven't had any units in all answers, and not having them hasn't affected the mark I recieve on those Qs in any way, even the ones where it explicitly asked for "Area under curve in sq units".

I'm sure its somewhere in the VCAA study design and if not, welcome someone to email VCAA to confirm it as solid evidence.

Do not take this advise for spesh or physics though, in both of them units are mandatory.

[IndefatigableLover]

My teacher (who marks Exam 2) also said that units do not have to be included. I don't have any concrete evidence though

I asked several methods teachers from my school because I wasn't sure either, and they all said units aren't required. Also every SAC I've done haven't had any units in all answers, and not having them hasn't affected the mark I recieve on those Qs in any way, even the ones where it explicitly asked for "Area under curve in sq units".

I'm sure its somewhere in the VCAA study design and if not, welcome someone to email VCAA to confirm it as solid evidence.

Do not take this advise for spesh or physics though, in both of them units are mandatory.

^Can agree with the above that I have heard teachers say the units are not necessary (apparently they had a person come in and explain to them about the no units thing as well as 'mathematical rounding')... though personally I each time I do an exam I end up putting in units anyway

[keltingmeith]

^Can agree with the above that I have heard teachers say the units are not necessary (apparently they had a person come in and explain to them about the no units thing as well as 'mathematical rounding')... though personally I each time I do an exam I end up putting in units anyway

Now it's my turn for the 'stupid' question - what's 'mathematical rounding'?