Edexcel biology Ial unit 6

Guys in June 2012 paper in Q#1 (a) the examiner was looking for a method of distribution of random (quadrats/samples) and he didn't accept throwing them randomly for that. Can anyone tell me another method please? x)

Explain that with tape draw a grid on the field and then randomly choose grids and place the quadrat on it

Reply 21

xbuttermelon

3

Original post by dnac5

I wrote ethical issues that you should consider if the people you want to carry the experiment out with agree to take part and for safety that the mouth piece has to be disinfected before it goes round as they might pass infection
Has anyone put anything similar :/

If I thought of this, I would've written it!

Reply 22

Aimen.

OP

7

Original post by dnac5

I wrote ethical issues that you should consider if the people you want to carry the experiment out with agree to take part and for safety that the mouth piece has to be disinfected before it goes round as they might pass infection
Has anyone put anything similar :/

The mouthpiece thing is justified but dude if you choose those people it means they've agreed already xD

Spoiler

Reply 23

MisterRabbit

4

Did everyone get 16 at 0.05, which was like 2.162??
For random error I put that temperature fertilisation may have an effect on sex... hahah
And did everybody calculate the DIFFERENCE for the vital capacity using many people, or just the MEAN volume?

Reply 24

dnac5

Original post by Aimen.

The mouthpiece thing is justified but dude if you choose those people it means they've agreed already xD

Spoiler

Yeah might be, but in a past paper I did about peoples teeth being tested this was an ethical implication so instead of leaving it blank I put that

Reply 25

dnac5

Anyone want to join a Biology IAL edexcel group. I know there's quite a few but if anyone's hasn't been added to one we could do one . :smile:

PM your numbers

Reply 26

Aimen.

OP

7

Original post by MisterRabbit

Did everyone get 16 at 0.05, which was like 2.162??
For random error I put that temperature fertilisation may have an effect on sex... hahah
And did everybody calculate the DIFFERENCE for the vital capacity using many people, or just the MEAN volume?

I calculated percentage difference!

Reply 27

Aimen.

OP

7

Original post by dnac5

Yeah might be, but in a past paper I did about peoples teeth being tested this was an ethical implication so instead of leaving it blank I put that

Lol that's a different case! In that case people didn't know their things were being used! but in this case people are actively participating!

Reply 28

xbuttermelon

3

Original post by Aimen.

I calculated percentage difference!

Original post by MisterRabbit

Did everyone get 16 at 0.05, which was like 2.162??
For random error I put that temperature fertilisation may have an effect on sex... hahah
And did everybody calculate the DIFFERENCE for the vital capacity using many people, or just the MEAN volume?

I used Increase in Vital capacity. Some did PERCENTAGE increase in vital capacity...idk which one is right

Reply 29

imanarif

1

i did difference in VC (so increase basically)

as for the critical value part i GOT 16 but then i was like the diff between the two bars is too small, so maybe I'm doing something wrong, and so randomly wrote critical value is greater than calculated and null is accepted. fml. bad luck :frown:

i mean i knew it!!!!

Original post by xbuttermelon

I used Increase in Vital capacity. Some did PERCENTAGE increase in vital capacity...idk which one is right

Reply 30

elhm18

2

Original post by Aimen.

I wrote that not all eggs are viable?
I know doesn't maKe sense xD

I wrote something similar, haha! I wrote maybe one or two eggs may have been inactive... no clue if it works.

Reply 31

elhm18

2

Also, there were many safety issues. They were: prolonged use of the respirometer may be harmful, the individuals participating cannot have any breathing/respiratory problems, epilepsy, or circulatory problems, soda lime is corrosive and should be handled with gloves and eye protection must be worn and the mouthpiece must be disinfected. But I wrote there were no significant ethical issues.

Reply 32

elhm18

2

And I think the correct test would be spearman's rank correlation test. I also chose a scatter graph. My limitations were other factors like other types of exercise or activities done during the same time period could've affected the result, one group may not be representative of the entire population, the height, age, and sex, and thats all I remember for that part...

Reply 33

imanarif

1

i drew a bar graph and chose spearmans rank test, will it be rejected ?

Reply 34

PlayerBB

17

Original post by imanarif

i drew a bar graph and chose spearmans rank test, will it be rejected ?

one of them will be rejected, what kinf of experiment did you choose, to compare the VC between different frequencies of yoga classes or as the frequency of yoga classes increase, the VC increase ?

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Reply 35

MisterRabbit

4

Original post by xbuttermelon

I used Increase in Vital capacity. Some did PERCENTAGE increase in vital capacity...idk which one is right

To be honest I dont think it matters as it makes sense either way.
I did something stupid and wrote calculate means, but I put use one person with zero yoga sessions as a control... so they might be generous on that even though I didn't specify difference in VC.
Does that make sense to you?

Anybody doing chem on tuesday??