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November 08, 2025, 04:43:51 pm
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Author Topic: VCE Methods Question Thread!  (Read 5783042 times)  Share 

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MandhreeE

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Re: VCE Methods Question Thread!
« Reply #14100 on: October 31, 2016, 03:19:28 pm »
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Quote from: Wyrden on October 31, 2016, 03:13:18 pm
Apologies for the image quality :P

Hi sorry, i just saw your solutions to that question and its different from mine. I was just wondering if you could have a look at the one i posted because that was the way Alwin (ATARnote methods tutor) explained to me. Sorry for the inconvenience!!
Thank you!!
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MandhreeE

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Re: VCE Methods Question Thread!
« Reply #14101 on: October 31, 2016, 03:25:14 pm »
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Quote from: Wyrden on October 31, 2016, 03:13:18 pm
Apologies for the image quality :P

sample size isn't large tho

sorry i don't quite understand...  :(
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Wyrden

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Re: VCE Methods Question Thread!
« Reply #14102 on: October 31, 2016, 03:28:17 pm »
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Quote from: MandhreeE on October 31, 2016, 03:19:28 pm
Hi sorry, i just saw your solutions to that question and its different from mine. I was just wondering if you could have a look at the one i posted because that was the way Alwin (ATARnote methods tutor) explained to me. Sorry for the inconvenience!!
Thank you!!

.

The sample size isn't considered large (np=2.4), hence your calculation of σ is different.
« Last Edit: October 31, 2016, 03:32:01 pm by Wyrden »
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MandhreeE

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Re: VCE Methods Question Thread!
« Reply #14103 on: October 31, 2016, 03:45:53 pm »
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Quote from: Wyrden on October 31, 2016, 03:28:17 pm
(Image removed from quote.).

The sample size isn't considered large (np=2.4), hence your calculation of σ is different.

 i'm so sorry for bothering again.I'm just honestly so confused with stats and which formula to use when.  i understand your solutions but whats confusing me is the MAV actual solution use the same methods of getting the SD as my solutions but have your answer....  what am i missing
i have attached a copy.
sorry i'll just let this go.

Thank you :)
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mandy.healy

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Re: VCE Methods Question Thread!
« Reply #14104 on: October 31, 2016, 04:13:10 pm »
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Can someone please help me with VCAA 2015 question 10 part a? i have no idea how the got those coordinates for T!!!
« Last Edit: October 31, 2016, 04:43:17 pm by mandy.healy »
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Pineapple66

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Re: VCE Methods Question Thread!
« Reply #14105 on: October 31, 2016, 04:20:21 pm »
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Hey guys how would you do vcaa 2015 exam 1 Q7b:

Solve 3e^t = 5 + 8e^-t for t.
didn't really get what they did in the examiner's guide

thanks!
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The Usual Student

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Re: VCE Methods Question Thread!
« Reply #14106 on: October 31, 2016, 04:23:57 pm »
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Quote from: Pineapple66 on October 31, 2016, 04:20:21 pm
Hey guys how would you do vcaa 2015 exam 1 Q7b:

Solve 3e^t = 5 + 8e^-t for t.
didn't really get what they did in the examiner's guide

thanks!

use a scalar, so times everything by e^t
then it is essentially a hidden quadratic so sub u=e^t
and solve it from there

btw i am horrid at methods so someone correct me if i am wrong
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argent

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Re: VCE Methods Question Thread!
« Reply #14107 on: October 31, 2016, 04:29:03 pm »
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Quote from: Wyrden on October 31, 2016, 03:13:18 pm
Apologies for the image quality :P

Thank you so much!!!
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mandy.healy

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Re: VCE Methods Question Thread!
« Reply #14108 on: October 31, 2016, 04:48:08 pm »
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Quote from: mandy.healy on October 31, 2016, 04:13:10 pm
Can someone please help me with VCAA 2015 question 10 part a? i have no idea how the got those coordinates for T!!!

please someone help with this question :(
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MB_

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Re: VCE Methods Question Thread!
« Reply #14109 on: October 31, 2016, 05:01:13 pm »
+1
Quote from: mandy.healy on October 31, 2016, 04:48:08 pm
please someone help with this question :(

You setup a triangle like in the image attached. Cos(x) is equal to your x and sin(x) is your y however as the radius of the circle is 2, using trig you find that your y is 2sin(x) and your x is 2+2cos(x) because the centre of the circle is at (2,0). Hopefully that helps

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Syndicate

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Re: VCE Methods Question Thread!
« Reply #14110 on: October 31, 2016, 05:07:42 pm »
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Quote from: MB_ on October 31, 2016, 05:01:13 pm
You setup a triangle like in the image attached. Cos(x) is equal to your x and sin(x) is your y however as the radius of the circle is 2, using trig you find that your y is 2sin(x) and your x is 2+2cos(x) because the centre of the circle is at (2,0). Hopefully that helps

(Image removed from quote.)

I guess MB_ beat me to it  :P.

In addition to what MB_ asserted, it would be worth having a look at polar coordinates (rcosx, rsinx) for the exam. 

Cartesian coordinates (x,y) = polar coordinates (rcosx, rsinx)


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MB_

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Re: VCE Methods Question Thread!
« Reply #14111 on: October 31, 2016, 05:08:28 pm »
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Quote from: MandhreeE on October 31, 2016, 03:07:03 pm
hi guys would some one mind explaining how to find the last two parts of question 10 in the sample 2016 exam 1? i can't seem to follow the solutions.
Thank you!!
The min/max questions?
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mandy.healy

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Re: VCE Methods Question Thread!
« Reply #14112 on: October 31, 2016, 05:09:25 pm »
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Quote from: MB_ on October 31, 2016, 05:01:13 pm
You setup a triangle like in the image attached. Cos(x) is equal to your x and sin(x) is your y however as the radius of the circle is 2, using trig you find that your y is 2sin(x) and your x is 2+2cos(x) because the centre of the circle is at (2,0). Hopefully that helps

(Image removed from quote.)

omg yes i think i get it thank you! one question , how do we know that the hypotenuse of that triangle is 2 though? so its becuase the radius is 2 yeah?
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Syndicate

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Re: VCE Methods Question Thread!
« Reply #14113 on: October 31, 2016, 05:11:55 pm »
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Quote from: mandy.healy on October 31, 2016, 05:09:25 pm
omg yes i think i get it thank you! one question , how do we know that the hypotenuse of that triangle is 2 though? so its becuase the radius is 2 yeah?

The centre of the circle C has the coordinates (2,0), whereas another point on the circumference of the circle has the coordinates (4,0). So from this, you can infer that the radius of the circle is 2 units.
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mandy.healy

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Re: VCE Methods Question Thread!
« Reply #14114 on: October 31, 2016, 05:12:12 pm »
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Quote from: MB_ on October 31, 2016, 05:08:28 pm
The min/max questions?

yes i am also having trouble with this part too bu on VCAA 2015 question 10 part d. Also thank you for your reply before! :)
« Last Edit: October 31, 2016, 05:16:22 pm by mandy.healy »
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