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A2 Biology | Post your doubts here

H

hassam

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cn we say here that in CC nutrient conc is kept constant throughout so its not a variable...bt in batch rate will decrease due to nutrient conc. falling
plus i dont get this that how s.d is realted to reliability....cud smone make it clear by quoting an example please
 

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princesskt

princesskt

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hassam said:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_52.pdf
i cant undrstand q1...part b........they only showed graph at day 3 for control.....and........watrs happening here
Click to expand...
day 3 is time when they start taking results and control would only be the one at the start of the exp.that shows %cell survival with no immobilized cells.....means the normal %.....
thats what we do when we suggest a control...........
 
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hassam

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done the papers from 2009 to 2011 .....still not satsifed......1st 3 papers i.e 2007 and 8 ones were hell easy...........knw any other source for practice??
 
princesskt

princesskt

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hassam said:
done the papers from 2009 to 2011 .....still not satsifed......1st 3 papers i.e 2007 and 8 ones were hell easy...........knw any other source for practice??
Click to expand...
YEAH ME TOO DONE WITH THESE PAPERS BUT NOT SATISSFIED............WHAT TO DO KNOW...........
HOPE OUR PAPER COMES EASY................:(:cry:
 
princesskt

princesskt

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hassam said:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_qp_51.pdf
q2 a why ms doesnt allow volume of culture medium....cos i think nutrient cconc shud be kept constant bt ms says only composition
Click to expand...

IN A CONTINOUS CULTURE ther eis a continous supply of nutrients and products removed,difficult to maintain same volume so its composition must be the same throuhout or we can say i think the concentration but it contains a mixture so composition better..........
 
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smartangel

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also in chi square test if our probability comes out to be greater than 0.05 then its due to chance..what abt t-test??
 
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hassam

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smartangel said:
also in chi square test if our probability comes out to be greater than 0.05 then its due to chance..what abt t-test??
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the probaillity we are talking abt here is probability of null hypothesis being correct......so if its less than 0.05 Null hpotheis is rejected,....and so on...........this 0.05 level is actuallyy 95 PERECENT PROBABILITY THAT NULL HYPOTHESIS IS CORRECT BT DONT KNW HOW,,,,,,SOME frther maths shud be ale to explain this 95 percent thing
 
Y

ying27kia

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smartangel said:
also in chi square test if our probability comes out to be greater than 0.05 then its due to chance..what abt t-test??
Click to expand...
It's the same. 0.05 act as decider for both chi square test and t-test.
if probability is greater than 0.05 it means null hypothesis is correct.
 
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