Chocoholic's Questions

[Mao]

using table works

Code: [Select]

y1=binomcdf(x,0.7,50,x)


hmm I tried doing this and it came up with ERR:ARGUMENT.

Anyhow, I know officially know how to go about answering this....Mission Accomplished!!!
Thanks heaps Mao, Excalibur and DivideBy0

mmm hehe non-CAS calculators must not be able to handle a variable in that then

[Glockmeister]

No, TI84s don't do variables natively unfortunately. That's what distinguishes the 84s from the 89s

[/0]

thanks mao

[Mao]

No, TI84s don't do variables natively unfortunately. That's what distinguishes the 84s from the 89s

tis a good thing that the methods course is being discontinued in a few years, making it all CAS =]

2010 or something i remember?

[ed_saifa]

No, TI84s don't do variables natively unfortunately. That's what distinguishes the 84s from the 89s

tis a good thing that the methods course is being discontinued in a few years, making it all CAS =]

2010 or something i remember?

My teacher hates the cas. He is old fashioned and says methods shouldn't even have calculators =S

[Glockmeister]

Isn't that what Neobeo believes too?

Mao: It will be CAS only starting 2010. 2009 is the last year the current Maths Methods (Non-CAS) will be accredited, after which students will be all CAS (which study design is accredited until 2010). So in 2011 (assuming they don't implement that Australian Certificate of Education thing they've been mooting for a while) it will be a completely different Methods curriculum from what we are doing at the moment.

[/0]

No, TI84s don't do variables natively unfortunately. That's what distinguishes the 84s from the 89s

tis a good thing that the methods course is being discontinued in a few years, making it all CAS =]

2010 or something i remember?

My teacher hates the cas. He is old fashioned and says methods shouldn't even have calculators =S

That's pretty ridiculous. How are we supposed to solve harder probability questions then? Not having access to CAS technology would mean restriction to only the simpler problems and concepts. And no calculators at all? LOL the probability section would have like... 1 question

[Mao]

i support the use of CAS in mathematics. simply, there are people who wants to learn maths maths, then there are just people who wants to learn to use maths [for their profession]

for them, knowing how to "compute" different things in CAS is important. they just need to know the principles behind what they are doing [the "method"] and get a processor to derive it for them to maximise efficiency.

[excal]

No, TI84s don't do variables natively unfortunately. That's what distinguishes the 84s from the 89s

tis a good thing that the methods course is being discontinued in a few years, making it all CAS =]

2010 or something i remember?

My teacher hates the cas. He is old fashioned and says methods shouldn't even have calculators =S

That's pretty ridiculous. How are we supposed to solve harder probability questions then? Not having access to CAS technology would mean restriction to only the simpler problems and concepts. And no calculators at all? LOL the probability section would have like... 1 question

You can do a lot of probability without a calculator...it's just that you don't learn most of it (and are generally a matter of 'plug number into formula').

[Chocoholic]

No, TI84s don't do variables natively unfortunately. That's what distinguishes the 84s from the 89s

tis a good thing that the methods course is being discontinued in a few years, making it all CAS =]

2010 or something i remember?

My teacher hates the cas. He is old fashioned and says methods shouldn't even have calculators =S

I like your teacher!! I'm not sure how different the CAS course is but I personally appreciate maths more by working out the question myself rather than just use calculator. I actually prefer not to use a calculator unless I have to ;-)

and Thanks for all yor help guys. It actually annoys me when I can't do a question so to get this one sorted out lowered my 'annoyance level' lol

[Chocoholic]

Ok so far probability is the easist topic in methods for me. I've gone a bit ahead of my class so I'm not sure if my understanding is 100% accurate or not. This is what I interpret the following question is wrong, I tried to include my 'thinking process' that lead to me to the answer so I know if I went wrong and where.

Consider the normal probability density function:



From this I can see that the is 2 and is 3. So 99.7% of the values lie in the range in between -7 and 11.

So to find should I integrate from -8 to 12(since 99.7% of the values lie between -7 and 11, this way I have more than 99.7% of the values).

[Mao]

whatttt

1. modelling the normal probability density function is NOT in the methods course.

2. the integral cannot be expressed by elementary functions, so don't even worry about it. if you want to find that "1" desparately, either use a CAS and actually input the data being infinities or use fnInt function with ridiculously large terminals (like -9999999 to 9999999)

3. again, this is NOT on the course

[Collin Li]

I prefer -1e99 and 1e99

[Chocoholic]

Thanks Mao. I think I'm using the wrong book. My school uses Heinemann but at home I use Essential(which is where I got this question from). The whole exercise for normal distribution uses this type of equations to find the mean and variance etc. So should I just skip this exercise???

Anyway, do you know if the Fourth Edition of Essential is made for CAS. Because that's the version I'm using and I think it may be the wrong version for 'normal' Methods.

oh well, I only wasted 5 minutes of my life learning this, however I did spend 20 minutes trying to do the Latex codes.
Thanks again!!!!!

[Mao]

haha

it is commendable that you are willing to give LaTeX a try

I think Essentials publish two titles for Methods, one normal one CAS (not sure, i don't have any).
CAS can be identified by the signatory TI-89 screen captures. however, some books incorporate both course into one (CAS is only a small expansion on top of normal MM) I am unsure of exactly how each textbook handles these.

the calculation method for mean and variance is correct, but for the purpose of MM, the mean and standard deviation of normal distributions will always be provided (or enough data be given for you to work these out). your calculations are again, outside of the course =]
EDIT: i take that back. I have not seen that way of calculating variance before... I cannot confirm nor critique it. haha, DEFINITELY outside of the course, hehe.