VCE Specialist 3/4 Question Thread!

[atar.notes.user]

You CAN get c as -pi/4, which depends on where you put the c, if you insert it in the left after you've done the respective integration (after you have separated the variables), you would get -pi/4, what is important tho is how you rearrange your terms so you get the answer.

got it thank you
1 more question when i got my y=+ve ans and -ve ans, how can i check that the -ve form is correct?

[shiba woof woof]

Could someone please explain Qs 3 c from the iTute Spesh Exam 1
Exam: http://www.itute.com/wp-content/uploads/2017-Specialist-Mathematics-Trial-Exam-1-update-1.pdf
Answers: http://www.itute.com/wp-content/uploads/2017-Specialist-Mathematics-Trial-Exam-1-Solutions-update-1.pdf

I don't understand how multiplying by 'i' in the complex plane has an effect on 'z', how do these transformations work?

when multiplying a Cartesian value by 'i', the point gets moved by 90 degrees in the anti clock-wise direction.
eg, 1 +i , is (1,1)
(1 +i) x (i) = i - 1 = -1 + i, which is (-1,1)

looking at these two points you can see that by multiplying a value on the complex plane by 'i' it moves the point by 90 degrees anticlockwise. So for your itute question, you just move the given point by 90 degrees anticlockwise.

[Max Kawasakii]

Could someone please explain Qs 3 c from the iTute Spesh Exam 1
Exam: http://www.itute.com/wp-content/uploads/2017-Specialist-Mathematics-Trial-Exam-1-update-1.pdf
Answers: http://www.itute.com/wp-content/uploads/2017-Specialist-Mathematics-Trial-Exam-1-Solutions-update-1.pdf

I don't understand how multiplying by 'i' in the complex plane has an effect on 'z', how do these transformations work?

Hard to explain, easier to draw.. Multiplying by 'i' will result in anticlockwise rotation of 90 degrees.





If you draw that sequence you might understand more.
EDIT: Added a visual representation for you, and of two other common properties.

[shiba woof woof]

got it thank you
1 more question when i got my y=+ve ans and -ve ans, how can i check that the -ve form is correct?

sub in the initial condition and see if it's true when it's +ve or -ve

eliminate the one that does not fit the initial condition

[Ahmad_A_1999]

when multiplying a Cartesian value by 'i', the point gets moved by 90 degrees in the anti clock-wise direction.
eg, 1 +i , is (1,1)
(1 +i) x (i) = i - 1 = -1 + i, which is (-1,1)

looking at these two points you can see that by multiplying a value on the complex plane by 'i' it moves the point by 90 degrees anticlockwise. So for your itute question, you just move the given point by 90 degrees anticlockwise.

Hard to explain, easier to draw.. Multiplying by 'i' will result in anticlockwise rotation of 90 degrees.





If you draw that sequence you might understand more.
EDIT: Added a visual representation for you, and of two other common properties.

Thanks so much guys! I need to get a 50 raw cause I failed methods

[BlinkieBill]

Hi
For exam 2 what exact values should we be using for confidence intervals?
I have been using
90% z=1.65
95% z=1.96
99% z=2.58

[plsbegentle]

Hi
For exam 2 what exact values should we be using for confidence intervals?
I have been using
90% z=1.65
95% z=1.96
99% z=2.58

yeah those look fine

[Denzel Ncube]

Is z=1.64 or 1.65 for a 90% CI???

[keltingmeith]

Is z=1.64 or 1.65 for a 90% CI???

1.65, but I'm pretty sure if VCAA want you to do a non-95% interval, they'll flat out tell you the z-value

[Ahmad_A_1999]

Could I please get help with Question 7 from the ITute Exam, I have no idea how to approach this
Exam: http://www.itute.com/wp-content/uploads/2017-Specialist-Mathematics-Trial-Exam-1-update-1.pdf
Answers: http://www.itute.com/wp-content/uploads/2017-Specialist-Mathematics-Trial-Exam-1-Solutions-update-1.pdf

Thanks in advance.

[atar.notes.user]

do u guys think a graphing question can appear tomorrow? graphing inverse trigs or anything

also, what kind of sampling questions can come tomorrow?

[LifeisaConstantStruggle]

do u guys think a graphing question can appear tomorrow? graphing inverse trigs or anything

also, what kind of sampling questions can come tomorrow?

My teacher has mentioned that the new study design places less emphasis on graphing (conics) so maybe less stuff on graphs? But a sampling question, we wouldn't know what they can come up with, maybe a hypothesis testing question or linear combination of variables, that would be basically it (they might be unexpected tho).

[atar.notes.user]

My teacher has mentioned that the new study design places less emphasis on graphing (conics) so maybe less stuff on graphs? But a sampling question, we wouldn't know what they can come up with, maybe a hypothesis testing question or linear combination of variables, that would be basically it (they might be unexpected tho).

sweet thanks
also, just a doubt for hypothesis testing, is the alternate hypothesis mean always LESS than the one given before (its never ≄) yeah?

[Sine]

sweet thanks
also, just a doubt for hypothesis testing, is the alternate hypothesis mean always LESS than the one given before (its never ≄) yeah?

will depend on the situtuation
we use =/= (doesn't equal) when we don't care whether it is greater or less than just there is some difference. Hence a two tailed test

[shiba woof woof]

there's going to be 11 pages on this years specialists exam 1... compared to the usual 9/10 so i feel as if there will be a graphing question.