Actually think that went incredibly well. Grade boundaries will be as high as last year's at least. When I get home to a computer I'll be up for any queries anyone has etc, plus I might have lost a couple marks so I need to check them out too
I think I got the sigma and Mean question wrong as well lol so don't worry about it, I'll still get method marks but it is a really stupid mistake to make.
For why is Poisson a good approximation distribution? I put:
number of possible genes mutating is large and probability of a gene mutating is small. Hence normal is good approximation to binomial (I meant to say Poisson will I lose both marks)?
For why is Poisson a good approximation distribution? I put:
number of possible genes mutating is large and probability of a gene mutating is small. Hence normal is good approximation to binomial (I meant to say Poisson will I lose both marks)?
"words to make the point that the test is for association in the population by adding thewords “in the underlying population” to the end of the statement about the null hypothesis,making it something like0: There is no association between the variables in the underlying population."
it says here in notes from MEI themselves to write 'underlying population', then why does it condone it in the mark scheme ?
The 2014 Paper also notes "NB Hypotheses must be in context. H0: no association, H1: positive association, earns SC1. Hypotheses must not be given in terms of ρ or mention correlation.", but the textbook writes correlation and uses ρ.
OCR makes the paper and examines. To me it seems as though they just ignore MEI or their course materials.
For why is Poisson a good approximation distribution? I put:
number of possible genes mutating is large and probability of a gene mutating is small. Hence normal is good approximation to binomial (I meant to say Poisson will I lose both marks)?
If you just made a reference to n being large and p being small you should get at least 1 mark. Another thing you could have said is that np < 10
The 2014 Paper also notes "NB Hypotheses must be in context. H0: no association, H1: positive association, earns SC1. Hypotheses must not be given in terms of ρ or mention correlation.", but the textbook writes correlation and uses ρ.
OCR makes the paper and examines. To me it seems as though they just ignore MEI or their course materials.
You give hypos in terms of p in the product moment test, spearmans you need to write them in context e.g there is no/a negative association between population percentage and fertiliser use in the underlying population
You give hypos in terms of p in the product moment test, spearmans you need to write them in context e.g there is no/a negative association between population percentage and fertiliser use in the underlying population
Yes. My point is that the textbook uses p and correlation. Have you noticed that?