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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: Hye on October 31, 2010, 12:25:58 pm

Title: boxplot
Post by: Hye on October 31, 2010, 12:25:58 pm

20,30,32,38,39,43,45,51,60,74,80

how do i find outliers using a cas

i enterd this in list 1 and went quick graph> boxplot and cant see any outliers


Thanks

the answer is 80

Title: Re: boxplot
Post by: naved_s9994 on October 31, 2010, 12:28:05 pm

Quote from: Hye on October 31, 2010, 12:25:58 pm

20,30,32,38,39,43,45,51,60,74,80

how do i find outliers using a cas

i enterd this in list 1 and went quick graph> boxplot and cant see any outliers


Thanks

the answer is 80

Q3 + 1.5 IQR

Or

Q1 - 1.5 IQR

They are the limits.

If any value is outside these set boundries then it is an outlier.

Title: Re: boxplot
Post by: Hye on October 31, 2010, 12:32:27 pm

yeah i know how to go about it by without calc, but how would you do it by CAS?

Title: Re: boxplot
Post by: onerealsmartass on October 31, 2010, 12:33:38 pm

-put the points into a spreadsheet.
-then boxplot them
-the boxplot will show you if there are any outliers
This method is quicker then using the rules :)

Title: Re: boxplot
Post by: TyErd on October 31, 2010, 12:34:17 pm

I don't get any outliers either. must be a mistake

Title: Re: boxplot
Post by: naved_s9994 on October 31, 2010, 12:36:10 pm

Quote from: onerealsmartass on October 31, 2010, 12:33:38 pm

-put the points into a spreadsheet.
-then boxplot them
-the boxplot will show you if there are any outliers
This method is quicker then using the rules :)

Sorry Hye, I forgot to read "CAS" in your question. I skimmed through it.

Okay doing what ORSA said will show you the boxplot. However it wont show outliers.

You have to do Mod Box Plot, and then it will show outliers.

In this question, there isn't any outliers btw, and the solutions are flawed.

Title: Re: boxplot
Post by: onerealsmartass on October 31, 2010, 12:37:12 pm

Generally the boxplot will show you if there are outliers, doesnt it?

Title: Re: boxplot
Post by: naved_s9994 on October 31, 2010, 12:37:51 pm

Quote from: onerealsmartass on October 31, 2010, 12:37:12 pm

Generally the boxplot will show you if there are outliers, doesnt it?

No it doesn't. Have a try, it wont show ALL of them though. (If there are any)

Title: Re: boxplot
Post by: TyErd on October 31, 2010, 12:42:21 pm

Yeah I'm pretty sure outliers will be shown on the CAS if there are any. In this example, there's definitely no outliers.

Title: Re: boxplot
Post by: _avO on October 31, 2010, 12:43:27 pm

Theres even a tick the box function to show outliers so the CAS doesn't lie.. only the question does

Title: Re: boxplot
Post by: naved_s9994 on October 31, 2010, 12:44:08 pm

It's funny how many stupid errors, TRIAL EXAM COMPANIES make!?!?!?!?
It's as though they never correct their stuff

Title: Re: boxplot
Post by: onerealsmartass on October 31, 2010, 12:47:07 pm

so how do we get it to show the outliers that dont appear if there are any??
what are the steps?

Title: Re: boxplot
Post by: _avO on October 31, 2010, 12:50:46 pm

Well for classpad theres a box that says show outliers and you just tick that, but i'm not sure about the TI-Nspire Cas