IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => GCE AS & A2 Level => Queries => Topic started by: EVIL DOCTOR on May 19, 2011, 05:01:01 pm

Title: really important S1
Post by: EVIL DOCTOR on May 19, 2011, 05:01:01 pm: really important
does stanard deviation change in coding??
does inter quartile range change in coding??
Title: Re: really important S1
Post by: studz on May 19, 2011, 06:25:52 pm: standard deviation will not change if for example the coding given is something like y=x-20 where the standard deviation is 3.641
when asked to find the standard deviation of the original data, it will be the same

however the standard deviation will change if the coding given for instance is y=x+100/2 where the standard deviation is 12.342
the standard deviation of the original data will be 24.684
adding 100 has no effect but the division by 2 has halved the standard deviation

and about the interquartile thing i am really not sure dude :/
i dont know if it even has got to do something with the coding lol

but i hope the above helped :D :)
Title: Re: really important S1
Post by: Tohru Kyo Sohma on May 19, 2011, 06:29:34 pm: huh....dude wat r u all talking about....im giving s1 paper too....and wat is all this coding about ???
can someone please tell me!!!
Title: Re: really important S1
Post by: studz on May 19, 2011, 06:32:26 pm: lol are u an edexcel student?
Title: Re: really important S1
Post by: EVIL DOCTOR on May 19, 2011, 06:36:21 pm: thanks alot studz u have been real helpful
i just saw a paper and started solving it and i faced a question like this which is better to represent data with IQR or standard dev.
and coding was involved ;)
Title: Re: really important S1
Post by: Tohru Kyo Sohma on May 19, 2011, 06:39:24 pm: Quote from: studz on May 19, 2011, 06:32:26 pm
lol are u an edexcel student?
no i do CIE.
Title: Re: really important S1
Post by: studz on May 19, 2011, 06:43:38 pm: Quote from: EVIL DOCTOR on May 19, 2011, 06:36:21 pm
thanks alot studz u have been real helpful
i just saw a paper and started solving it and i faced a question like this which is better to represent data with IQR or standard dev.
and coding was involved ;)

ur welcome mate :)

mimiswift u needn't worry then
we were talking about edexcel
Title: Re: really important S1
Post by: Tohru Kyo Sohma on May 19, 2011, 06:44:51 pm: ohhh .....ok :D
Title: Re: really important S1
Post by: your sister on May 25, 2011, 05:14:57 am: Quote from: studz on May 19, 2011, 06:43:38 pm
ur welcome mate :)

mimiswift u needn't worry then
we were talking about edexcel

phew

heart skipped a beat ::)
lol (:
Title: Re: really important S1
Post by: Nobody on May 25, 2011, 03:44:34 pm: Quote from: your sister on May 25, 2011, 05:14:57 am
phew

heart skipped a beat ::)
lol (:

My heart stopped beating until i saw studz's last post. :-X
Title: Re: really important S1
Post by: studz on May 27, 2011, 08:09:04 pm: haha! u all are welcome :P