Edexcel Biology Unit 6 IAL (WBIO6)/ May 13th June 2016

when i saw the first question (lizard one), i dropped all hope of getting and A*

What about the critical value related que 2d?

Oh that's where **** got real. I calculated the degree of freedom to be 4. But there was no 4 on the table so I used the value for 6 at 95% confidence level.

However, most of my friends used 16 because they did 9+9-2.

The given equation for degrees of freedom was n1+n2-2 where n1 and n2 represent the size of the group being tested. I thought that, since we have 6 apple types, 3 from each variety, 3+3-2=4.

And thing that gives me the chills is that the critical value at 6 was lower than the calculated value while the critical value at 16 was higher. So, in one case, the null hypothesis is accepted while in the other it is rejected. So the whole question goes wrong.

For ques 3 table, is it ok to give the dependent variable heading as maximum volume of air exhaled after deep inhalation(dm^3) instead of increase in vital capacity? Provided that for frequency of participation in yoga classes i started with 0days as negative control!

They might give you ECF marks if you got the wrong degree of freedom?

Oh that's where **** got real. I calculated the degree of freedom to be 4. But there was no 4 on the table so I used the value for 6 at 95% confidence level.

However, most of my friends used 16 because they did 9+9-2.

The given equation for degrees of freedom was n1+n2-2 where n1 and n2 represent the size of the group being tested. I thought that, since we have 6 apple types, 3 from each variety, 3+3-2=4.

And thing that gives me the chills is that the critical value at 6 was lower than the calculated value while the critical value at 16 was higher. So, in one case, the null hypothesis is accepted while in the other it is rejected. So the whole question goes wrong.

you can understand my feelings :'( i did this same shitty thing like i took 6 where the entire world took 9. It was an easy 4 mark que and since majority took 9 probaby that is the right one. There would not be a problem if null hypothesis was accepted in all cases

Did you use one subject for the experiment? You should have used multiple subjects at differing yoga course frequencies.
And the dependent variable you used (maximum volume of air exhaled after deep inhalation) is vital capacity. I don't think vital capacity would count as the dependent variable. Also, at the beginning of the question it said plan an experiment to show the effect of differing yoga frequencies on vital capacity. So it is clear that the vital capacity changes, be it a normal increase or percentage increase.

Mine looked like this

Yes i used one athlete who inhaled nd exhaled through the spirometer before going to yoga clses and the process was repeated for every 3days for 3months.
So i m not gonna receive any credit for the table and the graph?? Since my headings and y axis labelling was wrong?

Maybe you will. I don't know. I would give you marks for method, if it's any consolation.

thats an awesome answer, WHY DIDNT I THINK OF THAT T_T.
i was an idiot and wrote release the lizards after experiment. i was thinking on the ethical side of things

Welfare of lizards: I wrote about the keeping the temperatures within the given limits as too low or high temperatures kills the lizards. Ensure that the depth of the soil used to cover the eggs should be thin enough so that it is easy for them to respire after they hatch.

Source of Random error: I talked about some eggs not being viable enough to hatch.

Is that right?

I also drew the same thing

i wrote the increase in vital capacity NOT PERCENTAGE INCREASE. is this okay?

thats an awesome answer, WHY DIDNT I THINK OF THAT T_T.
i was an idiot and wrote release the lizards after experiment. i was thinking on the ethical side of things

I wrote releasing them to their habitat and handling them with care. So you're saying it's wrong?