*Biology Paper 5 tips*

[perky1]

Sure I can always give it a try
Can you please give the link to the question paper?

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w12_qp_53.pdf

 

[knowitall10]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_53.pdf

They used serial dilution, don't you think? The formula: C1V1=C2V2.
What does the marking scheme say?

 

[msid94]

how to calculate degree of freedom??? help pleaseee

n-1 where n is the total number of values

 

[radhika bhandari]

can nyone make me clear about significance in t-test??? and confidence level???? u can link significance in t test to question no.1 c(ii) may june 2010 variant 53

 

[perky1]

They used serial dilution, don't you think? The formula: C1V1=C2V2.
What does the marking scheme say?

it has weird answer which i am no getting

 

[demon29]

n-1 where n is the total number of values

thanks for the reply

 

[Kinki Tiffany 12]

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_s09_qp_5.pdf

how to find the degree of freedom in qns 3b part iv?

 

[demon29]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s09_qp_5.pdf

how to find the degree of freedom in qns 3b part iv?

there are 2 pH values so n-1+n-1
they mentioned time so in the beginning of the question it is mentioned as " 20 hours at each pH"
so, 20-1+20-1= 38

 

[Warrior66]

Salamo Alaekum!
Jazak' Allaahu Khairan knowitall10 !!!!!!!!
May Allaah bless you for this with successes in this life and the next. A'ameen.
Great job! (Y)

 

[Jinosupreme]

NEED HELP!

I am a bit confused with Degree of Freedom,
When do we use n-1? When do we use (n-1)+(n-1)? Help please guys

 

[daredevil]

NEED HELP!

I am a bit confused with Degree of Freedom,
When do we use n-1? When do we use (n-1)+(n-1)? Help please guys

when u hav 1 set of sample to experiement then u use (n-1)

if u have more than 1 then u use (n-1)+(n-1)

Basically like if u have to find out if the fur colour is affected by pollution (just as a random example.. not an educated one ) then u use (n-1) because it is only one group of rabbits that u are using....


but if u are comparing e.g. the size of leaves of a) leaves growing in shade; and b) leaves exposed to sunlight then u use (n-1)+(n-1) to calculate the degree of freedom for that set of calculations... i hope u get it.... tell me if u don;t

 

[Jinosupreme]

when u hav 1 set of sample to experiement then u use (n-1)

if u have more than 1 then u use (n-1)+(n-1)

Basically like if u have to find out if the fur colour is affected by pollution (just as a random example.. not an educated one ) then u use (n-1) because it is only one group of rabbits that u are using....


but if u are comparing e.g. the size of leaves of a) leaves growing in shade; and b) leaves exposed to sunlight then u use (n-1)+(n-1) to calculate the degree of freedom for that set of calculations... i hope u get it.... tell me if u don;t

Does that mean Chi Squared test is more likely to use (n-1)+(n-1) as it is comparing 2 mean value of 2 sets of data? Umm what about T test?

 

[daredevil]

Does that mean Chi Squared test is more likely to use (n-1)+(n-1) as it is comparing 2 mean value of 2 sets of data? Umm what about T test?

umm i'm not sure... i have used n-1 for chi too so can't say anything about wats more probable ....
same thing holds for T test

 

[MemoryMatrix 21]

ok when to use n1+n2-2 ??

 

[Spongebobfan]

thank you very much for these!!

 

[joanna omar]

I have doubts in PAPER 5
Nov 2011 V1-->Q2 (C)
June 2011 V1 ->Q1 (D)

knowitall10

 

[bizarre girl]

here u go

 

[bizarre girl]

R there any useful tips for paper 5 physics as well ?

S here u go

 

[UsMAn_U7]

What they mean when they say there isno overlap between datas ? I have come across this many times in many marking schemes

 

[MemoryMatrix 21]

when to use n1+n2-2 ??