Yessssss thanksss asem93 love youuu Lol had litteraly 5 seconds to do the last question and ddint read the question jus purely guesssed thoseee thanks(Original post by asem93)
No reliability is doing it twice and getting an average making sure results are valid hence identifying anomalies.
For accuracy, measure to 2 dp/ 3sf something like thatare they all enough for 4 marks yh?
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OCR Biology F211 Exam - Tues 11'th January 2011 watch
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dundiddyknoe
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- 11-01-2011 18:15
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asem93
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- 11-01-2011 18:16
(Original post by dundiddyknoe)
Yessssss thanksss asem93 love youuu Lol had litteraly 5 seconds to do the last question and ddint read the question jus purely guesssed thoseee thanksare they all enough for 4 marks yh?
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- 11-01-2011 18:17
(Original post by emmaD96)
Reliability - repeat each experiment several times and calculate an average (this will also help to identify any anomalies)
Accuracy - something about decimal places. i know i got this one wrong. -
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- 11-01-2011 18:17
(Original post by asem93)
I dunno the order but these are the ones I remember
erythrocytes, oxyhaemoglobin, affinity, co2??and Bohr was last 1
Also, for the accuracy question, could you say use 0.05 0.10 0.15 instead of 0.10 0.20? Or is that something else, like precision....
and how did people work out the 50% question? I think I got -1750. lol. probably wrong.. -
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- 11-01-2011 18:18
But omgggggg im sooooo glad its overrrrr im gonna burn my ocr as biology book now and focus on a2!!!!!
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asem93
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- 11-01-2011 18:18
(Original post by 786girl)
it was 4 marks though so Im assuming we needed to elaborate or mention more things... -
asem93
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- 11-01-2011 18:19
(Original post by liam532)
Yep, even though I spelt erythocytes wrong..and Bohr was last 1
Also, for the accuracy question, could you say use 0.05 0.10 0.15 instead of 0.10 0.20? Or is that something else, like precision....
and how did people work out the 50% question? I think I got -1750. lol. probably wrong..
also for accuracy take intermediate values of the sucrose conc. -
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- 11-01-2011 18:20
assuming results come out on the first thursday of march its gonna be the 3rd of march 2011 LOL looking forward to it!!
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- 11-01-2011 18:20
what did everyone put for the question about cutting the flower stem before emmersing in water?
also whats the difference between animal and plant division?
and finallyy,, the question about the roots water molecules take through cell membrane- how vague was that? some people put about the symplast pathway, but i put about channel proteins?! help please xxxxxxxxxxxxx -
asem93
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- 11-01-2011 18:20
(Original post by 786girl)
it was 4 marks though so Im assuming we needed to elaborate or mention more things... -
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- 11-01-2011 18:20
ahh cool.
ya, that's what i did (i think!)
oh, 3 more Q's
How did people answer the 2 ways Plants are different to animal's when they under go cell division (or something like that)
andd.. how 'bout the one where you cut the stem (how does this help, or something along those lines..)
finally: the smoke through xylem questionLast edited by liam532; 11-01-2011 at 18:23. -
Sohailahmed
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- 11-01-2011 18:21
I was soo angry, i revised the heart thoroughly and understood everything but never came up
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- 11-01-2011 18:21
(Original post by Rosi M)
Lol thats nice of you.. Glad it helpedHaha i'll consider tutoring
How did you find todays paper? Ah i want the answers!?
also, about the answers, has noone managed to get a copy of the exam paper and post the answers here? -
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- 11-01-2011 18:24
(Original post by asem93)
Increased reliability just talk about repeating the experiment and taking an average.
Accuracy is measure to more decimal places/ use more accurate measurements.
And water is polar so it must go through channel proteins / aqua porins.... etc -
Princess Kawaii
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- 11-01-2011 18:25
(Original post by PhoTaydo)
For the prophase, metaphase, anaphase, telephase question, which one did 'Cell membrane Constricts' go to? what does that mean anyway, kinda mind raped me xD -
Neil_Pietro
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- 11-01-2011 18:29
this paper was really hard! All the other past papers were so easy compared to this one! Who thinks that the grade boundaries might be lowered? There were questions in this paper that werent even in our syllabus, i mean, i dont know anything about white blood cells and that nonsense?! I was really angry when i came out of that exam!
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asem93
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- 11-01-2011 18:29
(Original post by cor898)
Surely using more dem places would improve precision rather than accuracy. I didnt know what to put
Taken from Wikipedia:
the accuracy of a measurement system is the degree of closeness of measurements of a quantity to its actual (true) value.
The precision of a measurement system, also called reproducibility or repeatability, is the degree to which repeated measurements under unchanged conditions show the same results. -
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- 11-01-2011 18:30
increasing the number of decimal places does increase the accuracy of the results, as it is closer to the true value of the actual molar concentration of the solution.
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- 11-01-2011 18:32
yeah the grade boundaries will be reasonably low due to the vagueness of the questions meaning a wide variety of answers from candidates. Probably around 42 marks for an A
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- 11-01-2011 18:32
(Original post by asem93)
No!
Taken from Wikipedia:
the accuracy of a measurement system is the degree of closeness of measurements of a quantity to its actual (true) value.
The precision of a measurement system, also called reproducibility or repeatability, is the degree to which repeated measurements under unchanged conditions show the same results.
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