Hi all, Seems like every time a binomial question comes up i get the likelihood wrong - i sum when im not meant to, or i dont sum when im meant to! Is there a general rule? for example september 2022 question 6, we had to sum the likelihoods, this doesnt make sense to me, as surely n bernoulli observations is just one binomial observation? but then april 2019 Q9 you dont need to sum the x... im not sure why this is any different Please could someone help?
I guess... 2022/9-Q9=>give you x_1~x_n ,which is independent,which ~ Ber(p).Every x are different,so we need to add them all. 2019/4-Q6=>give you x directly,which ~ Bin(n,p). x is a total amount,so we have calculated. The original question:"We denote by X the number of policies with a total amount of over £5,000 claimed in a calendar year,and assume that X has a Binomial distribution." You can try to pick out similar question from 2005 to 2022 to observe the differences, and it sometimes will be easier to find the blind points.
