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Can someone explain how to find the independent and dependent variable ? For paper5
hey are there any notes for biology paper 5. im finding it quite hard
check out the first two posts on this thread- they're really useful!
https://www.xtremepapers.com/community/threads/biology-paper-5-tips.27105/
Aoa wr wb!
I wanted to know when is it appropriate to use the chi squared test, and when do we have to use the t-test?
If someone could please elaborate with examples?
JazakAllah khair
Irfan1995
I have an 84 in AS bio
in p4 i wnt get less dan 85
How much do i av to get in p5??? to get an A*???
honestly speaking i never knew b4, there was a syllabus fr p5
i'm really bad at diagrams...
When you are dealing with only one set of date: use chi-squared test
When you're comparing between two sets of data: use the t-test
Also, according to what I know, the chi-squared test is used for discontinuous data while the t-test is used for continuous data.
When you are dealing with only one set of date: use chi-squared test
When you're comparing between two sets of data: use the t-test
Also, according to what I know, the chi-squared test is used for discontinuous data while the t-test is used for continuous data.
Thank you.
But if you could just clarify,
For qn 2 of this paper, we have two sets of data here, and yet we are using the chi-squared test, why is that?
And besides, isn't light absorbance continuous rather than discrete?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_52.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_ms_52.pdf
Thank you, and sorry for the trouble.
maybe becuase pollen collected from same plant not two different plants. and its discontinous because its collected after the day is over not continously during the day. So thats why maybe its discontinous data. I need confirmation though.
may 2010- Q2- x400 is a very low magnification. U cannot see organelles. Try using the formula magnification= size of drawing/actual size. U will know that its hard to view cells less than 1mm in size at this mag.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s10_qp_11.pdf Q2 Q11 Q30 Q39
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s10_ms_11.pdf Q2 C 11 A 39 C 30 D
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_qp_1.pdf Q12 D Q13 A Q22 C Q26 D
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_ms_1.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w06_qp_1.pdf Q13 C
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w06_ms_1.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s05_qp_1.pdf Q38 A
Thank you.
But if you could just clarify,
For qn 2 of this paper, we have two sets of data here, and yet we are using the chi-squared test, why is that?
And besides, isn't light absorbance continuous rather than discrete?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_52.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_ms_52.pdf
Thank you, and sorry for the trouble.
Hmm, maybe my previous explanation was a too simplistic one.
With a chi-squared test, you have expected values and observed values. The value of chi-squared just tells you how much the observed values deviate from the expected ones. You don't actually have two sets of data. You have one set of data (the observed values), and you're comparing it to a standard (the expected values).
In a t-test, you have two different sets of data. Neither one of them is "correct" or can be used as a "standard". You just have two different sets of values and you're trying to see how significant is the difference between them.
As for light absorbance, it's definitely discrete. The explanation that follows might be a bit difficult to understand if you don't take Physics (more specifically, quantum physics):
Electrons can only move within certain 'energy shells'. If a photon (whose energy is equal to the difference in energies between two shells) is provided, then an electron will be promoted to the next shell by absorbing the photon. This photon has a specific frequency/wavelength. The electron does not absorb a range of frequencies, only specific ones. This is why the frequency of light absorbed is discrete.
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