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November 08, 2025, 05:22:32 am
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Author Topic: can someone solve this using CALC?  (Read 1281 times)  Share 

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qshyrn

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can someone solve this using CALC?
« on: September 18, 2010, 09:17:14 pm »
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this is from the 2009 vcaa
 i tried solving this (see image) but my ti-89 fucks up and then i have to take the batteries out and wait 10 minutes.. wouldnt be ttooo great in an exam (does anyone know how to cancel/stop a command) .
      
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stonecold

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Re: can someone solve this using CALC?
« Reply #1 on: September 18, 2010, 09:18:58 pm »
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I swear to god Mathods CAS is so shit.  calculators suck, always fuck up and freeze, take ages to draw graphs, and you have to know extra shit...
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fady_22

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Re: can someone solve this using CALC?
« Reply #2 on: September 18, 2010, 10:13:04 pm »
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Quote from: qshyrn on September 18, 2010, 09:17:14 pm
this is from the 2009 vcaa
 i tried solving this (see image) but my ti-89 fucks up and then i have to take the batteries out and wait 10 minutes.. wouldnt be ttooo great in an exam (does anyone know how to cancel/stop a command) .
     

Just press the ON button, and then enter. 
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InitialDRulz

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Re: can someone solve this using CALC?
« Reply #3 on: September 18, 2010, 10:24:19 pm »
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I just tried using my Ti-Nspire, i get an argument mismatch :S
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qshyrn

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Re: can someone solve this using CALC?
« Reply #4 on: September 18, 2010, 11:12:23 pm »
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Quote from: InitialDRulz on September 18, 2010, 10:24:19 pm
I just tried using my Ti-Nspire, i get an argument mismatch :S
u mustve typed somethign wrong...  try typing the SD as 'a' , and solve for it.
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moekamo

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Re: can someone solve this using CALC?
« Reply #5 on: September 19, 2010, 04:12:07 am »
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its easier if you recognise that the equation is for the normal distribution curve with

The integral also means that

You can then convert this to z values to give:

solving this with the calculator gives and so to 4 D.P
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taiga

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Re: can someone solve this using CALC?
« Reply #6 on: September 19, 2010, 09:53:29 am »
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you're doing the question wrong ;)
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kriptik

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Re: can someone solve this using CALC?
« Reply #7 on: September 19, 2010, 10:39:52 am »
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i tried using this online website http://www.wolframalpha.com and it couldn't solve it,  it said something about error function
« Last Edit: September 19, 2010, 10:43:34 am by kriptik »
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qshyrn

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Re: can someone solve this using CALC?
« Reply #8 on: September 19, 2010, 12:17:46 pm »
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Quote from: moekamo on September 19, 2010, 04:12:07 am
its easier if you recognise that the equation is for the normal distribution curve with

The integral also means that

You can then convert this to z values to give:

solving this with the calculator gives and so to 4 D.P
yeah, i know im meant to do it this way so was just curious if other way would work
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TyErd

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Re: can someone solve this using CALC?
« Reply #9 on: September 19, 2010, 12:24:36 pm »
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moekamo, how did you find out that the z score equals 2.575829303???

and I also tried on the calculator with that massive equation but i cant do it either...

i've attached the actual question
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Duck

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Re: can someone solve this using CALC?
« Reply #10 on: September 19, 2010, 12:34:00 pm »
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On and clear will stop the calc if it's frozen, learnt this in my last sac.
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qshyrn

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Re: can someone solve this using CALC?
« Reply #11 on: September 19, 2010, 01:06:53 pm »
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Quote from: TyErd on September 19, 2010, 12:24:36 pm
moekamo, how did you find out that the z score equals 2.575829303???

and I also tried on the calculator with that massive equation but i cant do it either...

i've attached the actual question
using INVERSE NORMAL on the calculator.     Pr(X<65.6)= 0.005 (by symmetry)  then you do invnorm(.005)  equate the answer isZ , which is equal to  (mean-65.6)/SD solve for SD
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TyErd

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Re: can someone solve this using CALC?
« Reply #12 on: September 19, 2010, 01:21:41 pm »
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question on inverse normal, is mean always 0 and SD = 1 ???
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qshyrn

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Re: can someone solve this using CALC?
« Reply #13 on: September 19, 2010, 01:29:01 pm »
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Quote from: TyErd on September 19, 2010, 01:21:41 pm
question on inverse normal, is mean always 0 and SD = 1 ???
yes
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Blakhitman

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Re: can someone solve this using CALC?
« Reply #14 on: September 19, 2010, 02:48:50 pm »
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Quote from: qshyrn on September 19, 2010, 01:29:01 pm
Quote from: TyErd on September 19, 2010, 01:21:41 pm
question on inverse normal, is mean always 0 and SD = 1 ???
yes

If the scores are converted to their standard form.
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