What do you think the grade boundary for an A? I found it rather easy, though screwed up completely q.3 worth 7 marks. I know a few answers if people want :P
1. u=52.5, sigma=3. Although you probably didn't post that one as it was the easiest o.O
Was q.6 the one on daily temperature?
6 was the 11 marker on temp yeah - does anyone have their value of s^2 and distribution - i accepted it but wondering if i did so correctly - i had ~N(24.3,0.845) - (cant remember if that was x or x bar
Okay that wasn't TOO bad. Most people at my college didnt get the Type 2 error question correct (including myself!), so that could bring the boundary down.
For the last question, last part...the question said
in the general case, show algerbraically that: P(R=0 and S=1) + P(R=1 and S=0) = P (T=1)
I stupidly wrote that as:
e^-2 * 3e^-3 + 2e^-2 * e^-3 = 5e-5 = RHS
I didnt GENERALISE it. how many marks will I lose?
Okay that wasn't TOO bad. Most people at my college didnt get the Type 2 error question correct (including myself!), so that could bring the boundary down.
For the last question, last part...the question said
in the general case, show algerbraically that: P(R=0 and S=1) + P(R=1 and S=0) = P (T=1)
I stupidly wrote that as:
e^-2 * 3e^-3 + 2e^-2 * e^-3 = 5e-5 = RHS
I didnt GENERALISE it. how many marks will I lose?
a lot of people seem to have found this easy, including me. when i walked out of the exam hall, i didn't feel too bad, not worse than my core 3 or core 4 exam anyway. although, this is a worrying sign to me that the grade boundaries will be high.
Was 7 the poisson distribution Q? Something about probability for 40 weeks being something 7. 8 was like 1 mark and 2 mark Q at first, cant remember the Q Then something about R=0 (R is that lambda sign, S is the mu sign, T is lamba + Mu [excuse my math spellings]). I have no idea; something along these lines maybe these will trigger ur thoughts.
Was 7 the poisson distribution Q? Something about probability for 40 weeks being something 7. 8 was like 1 mark and 2 mark Q at first, cant remember the Q Then something about R=0 (R is that lambda sign, S is the mu sign, T is lamba + Mu [excuse my math spellings]). I have no idea; something along these lines maybe these will trigger ur thoughts.
No I remember it roughly though, IIRC the 8b ii was like lambda = 2.73 so probability of greater than 2 = 1- (e^-(2.73)(1 + 2.73)). The one of the 8 part ii was treating it as a normal with N(44,44) and the other was considering it as a binomial and then a normal to get (5.74, some other stuff), ring any bells?
Okay that wasn't TOO bad. Most people at my college didnt get the Type 2 error question correct (including myself!), so that could bring the boundary down.
For the last question, last part...the question said
in the general case, show algerbraically that: P(R=0 and S=1) + P(R=1 and S=0) = P (T=1)
I stupidly wrote that as:
e^-2 * 3e^-3 + 2e^-2 * e^-3 = 5e-5 = RHS
I didnt GENERALISE it. how many marks will I lose? anyone plz
No I remember it roughly though, IIRC the 8b ii was like lambda = 2.73 so probability of greater than 2 = 1- (e^-(2.73)(1 + 2.73)). The one of the 8 part ii was treating it as a normal with N(44,44) and the other was considering it as a binomial and then a normal to get (5.74, some other stuff), ring any bells?
The one's youve describe sound familiar but werent they question 7? i only finished this a hour ago and cant remmeber the question order :P
Okay that wasn't TOO bad. Most people at my college didnt get the Type 2 error question correct (including myself!), so that could bring the boundary down.
For the last question, last part...the question said
in the general case, show algerbraically that: P(R=0 and S=1) + P(R=1 and S=0) = P (T=1)
I stupidly wrote that as:
e^-2 * 3e^-3 + 2e^-2 * e^-3 = 5e-5 = RHS
I didnt GENERALISE it. how many marks will I lose? anyone plz
It was worth 3 marks but it did say in the question give a algebraic proof or something so prehaps 1 or 2. Unless it was purely there to catch people out i wouldnt have thought theyd take all the marks away.
It was worth 3 marks but it did say in the question give a algebraic proof or something so prehaps 1 or 2. Unless it was purely there to catch people out i wouldnt have thought theyd take all the marks away.