Edexcel IAL Biology Unit 5 (WBI05) Scientific Article Discussion - June 2016

Thank you soooo much!
Let me try to answer your question though.
You usually use significance level 0.05 (I.e 95% confidence level) and then you compare the student calculated t value with the critical value at 0.05, and then draw out a conclusion from that. If the students calculated value is higher than the critical value then you accept that there is a correlation in the two variables that you're investigating. (Eg: There is a significant correlation between the increase in conc of rennin and the rate of milk clotting; if there is a null hypothesis stated then you reject it and you have to mention this in the ans as well aaaaand you can also state if there is a positive or a negative correlation) if the student's calculated value is lower than the critical value then you state that there is no significant correlation between blah blah and you accept the null hypothesis (state null hypothesis only if it was asked in the question before) if asked, you have to give the biological explanation as well.
Sometimes degrees of freedom is given and you have to choose in that case don't panic it's just the sample size.

0.05 is the probability and 95% is its percentage.

I hope it's clear to you now.

I think it really is worth it! There's 59 predicted questions with paragraph answers which gives a full explained answer, list of all topics, words in the english dictionary with their definitions and then words from biological dictionary with definitions!

So cool

I've just paid, but mine says that I also have 1 pending transaction???? Could you please check if yours says the same thing?

Mine says the same thing!

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You already received yours? Mine's taking a while as since the past two days it says that the payment is still being processed. Looks like i have to mail them

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Can't you screenshot it for us from ur phone???


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Really?? What does that mean?? I'll have to pay twice or what?

I don't think so. I mailed them so hopefully it should be sorted out by tomorrow. I think you should mail them too!

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Are you guys prepared for biology unit 6 on 13th ?

I'm trying.. mayn i want full UMS but this seems so hard.. so I've come up with a few tips for that.. well what about you?
As in 5 days remaining and it's much harder than chem 6 or phy 6 :/
That planning **** .... ughhh

Same!!! Trying so hard to get an A* in the paper but that seems impossible so like 5 days remaining, 5 daaays till we will it off!!

But it has same repeating stuff so it ain't impossible getting an A*

Yeah but I always lose marks for the limitations and valid conclusion parts and sometimes I get mixed up in the last part of question 1 which drifts me off from the A* but l am going to make some notes so hopefully I'll pull it off

Dude they repeat the same limitations all the time like experimental conditions differ from real ones etc. so just memorise 'em and you'll be in good shape

Could you please list some examples, cos I also struggle with limitations!

Sure why not! Although they'd differ from experiment to experiment but the one's that'll work in all cases are
1. difficult to control all variables affecting the experiment.
2. another variable may be acting as a limiting factor.
3. idea that experimental conditions do not match real conditions.
4. Testing with more than one type of (say, bacteria, mineral ions, seeds,.. watever the experiment states)(this last one is less applicable to all experiments but since it is a 3 mark question.. so the first 3 will do x) )

Sure why not! Although they'd differ from experiment to experiment but the one's that'll work in all cases are
1. difficult to control all variables affecting the experiment.
2. another variable may be acting as a limiting factor.
3. idea that experimental conditions do not match real conditions.
4. Testing with more than one type of (say, bacteria, mineral ions, seeds,.. watever the experiment states)(this last one is less applicable to all experiments but since it is a 3 mark question.. so the first 3 will do x) )

I don't think we should be worried for unit 6! We just have to take the time to memorize and I think we'll be okay.

Does anyone have any ideas as to what experiment is likely to come up?