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Author Topic: S1 and S2 DOUBTS HERE!!!!  (Read 63417 times)

Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #300 on: December 08, 2011, 11:51:47 am »
exactly
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #301 on: December 08, 2011, 11:52:12 am »
That's me in the videos
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #302 on: December 15, 2011, 09:34:36 am »
hello

I would really appreciate it if someone explain the atttached question for me

Thanks in advance  :)
« Last Edit: January 06, 2012, 05:10:23 pm by ~ Miss Relina ~ »
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #303 on: December 15, 2011, 02:42:07 pm »
z=(23-25)/4=-.5
look this up. Since -.05<0, look up 0.5 and subtract from 1.
1-0.6915=0.3085
Since this is for each of the three bikes the answer is 0.3085^3
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #304 on: December 15, 2011, 02:59:56 pm »
Quote from: astarmathsandphysics on December 15, 2011, 02:42:07 pm
z=(23-25)/4=-.5
look this up. Since -.05<0, look up 0.5 and subtract from 1.
1-0.6915=0.3085
Since this is for each of the three bikes the answer is 0.3085^3

Sir I did the same but the answer was that one
attached
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #305 on: December 16, 2011, 08:53:23 am »
They are wrong. Phone them and tell them.
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #306 on: December 16, 2011, 09:32:32 am »
Quote from: astarmathsandphysics on December 16, 2011, 08:53:23 am
They are wrong. Phone them and tell them.

Actually if I do have their number I would do  immediately  ;)


here is other question which I want to be sure about it

why the Q3 is not 34 only
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #307 on: December 16, 2011, 10:09:24 am »
They have done it the way I would do it.
Note that if you have 3 number 1,5,7 the middle is the second, the middle of the first and third one (1+3)/2=2
There are 30 numbers so 3/4(1+30)=23.25
34 is the 23rd one but I want the 23.25th one so go 1/4 of the way from 34 to 36 which is 1/2 then add it to 34.
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #308 on: December 16, 2011, 04:50:25 pm »
Quote from: astarmathsandphysics on December 16, 2011, 10:09:24 am
They have done it the way I would do it.
Note that if you have 3 number 1,5,7 the middle is the second, the middle of the first and third one (1+3)/2=2
There are 30 numbers so 3/4(1+30)=23.25
34 is the 23rd one but I want the 23.25th one so go 1/4 of the way from 34 to 36 which is 1/2 then add it to 34.

then how the Q1 was 19 ???

Sir is that method above known ??? I mean in my S1 book they never taught us about this method just find 75% of the no. then if it is not a whole no. then round up and find the corresponding term


 :-X
« Last Edit: December 16, 2011, 04:54:21 pm by ~ Miss Relina ~ »
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #309 on: December 17, 2011, 09:29:30 am »
I know. I don't like the book method - it is technically incorrect. My method is the statistically correct method.
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #310 on: December 17, 2011, 02:51:44 pm »
Quote from: astarmathsandphysics on December 17, 2011, 09:29:30 am
I know. I don't like the book method - it is technically incorrect. My method is the statistically correct method.

ok can plz Sir give me the equations for :
Q1
Q2
Q3 by your method
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #311 on: December 17, 2011, 05:53:31 pm »
There is no equation but actually a method. I treat a list as continuous and use
1/4 (n+1) for lower quartile
1/2 (n+1) for median
3/4 (n+1) for upper quartile.
If any of these result in a decimal I interpolate as I did for your question.
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #312 on: December 17, 2011, 06:27:56 pm »
Quote from: astarmathsandphysics on December 17, 2011, 05:53:31 pm
There is no equation but actually a method. I treat a list as continuous and use
1/4 (n+1) for lower quartile
1/2 (n+1) for median
3/4 (n+1) for upper quartile.
If any of these result in a decimal I interpolate as I did for your question.

Thanks alot Sir
 Q1 -the above method can be used for Edexcel too ???
Q2 in the attached pic. it's wrong I'm pretty sure but want to know if you agree  or not ???

Thanks in advance  :D
« Last Edit: December 17, 2011, 10:47:38 pm by ~ Miss Relina ~ »
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Offline astarmathsandphysics

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #313 on: December 19, 2011, 11:54:35 am »
negative skew actually since longer tale on left than right.
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Offline ~ Miss Relina ~

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Re: S1 and S2 DOUBTS HERE!!!!
« Reply #314 on: December 19, 2011, 12:32:01 pm »
Quote from: astarmathsandphysics on December 19, 2011, 11:54:35 am
negative skew actually since longer tale on left than right.


hahaha.....Thanks alot
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