CT3 questions that are out of scope of CS1 (2013-2018)

[John Lee]

Questions on PGFs are out of scope:
S18 Q2

Questions on compound distributions are out of scope:
A13 Q10, S13 Q8iv-, A14 Q7ii-, S14 Q3, A15 Q3, A16 Q9iv,10vii, S16 Q9ii, S17 Q7

Questions on ANOVA are out of scope:
A13 Q8i,iib, S13 Q9v, A14 Q9, S14 Q9, A15 Q10, S15 Q6, A16 Q8, S16 Q10, A17 Q6i , S17 Q9iii- , A18 Q8 , S18 Q9iv-

 

[ykai]

Thank you! This saved me a lot of time to help me complete all the 2005~2022 exam questions.

 

[John Lee]

Alas, I've only gone back to 2013 as it took ages - but hopefully the topic areas which are now off syllabus should make it quicker to identify the questions.

 

[ykai]

Yes, I could identify them now.Thank you.

 

[Molly]

Questions on PGFs are out of scope:
S18 Q2

Questions on compound distributions are out of scope:
A13 Q10, S13 Q8iv-, A14 Q7ii-, S14 Q3, A15 Q3, A16 Q9iv,10vii, S16 Q9ii, S17 Q7

Questions on ANOVA are out of scope:
A13 Q8i,iib, S13 Q9v, A14 Q9, S14 Q9, A15 Q10, S15 Q6, A16 Q8, S16 Q10, A17 Q6i , S17 Q9iii- , A18 Q8 , S18 Q9iv-

Hi John,
please could you confirm if sept 2012 q 4 is out of scope?

Thanks

 

[Molly]

Hi John,
please could you confirm if sept 2012 q 4 is out of scope?

Thanks

Sorry, i didnt mean Q4, i meant question 10!

 

[John Lee]

Sorry, i didnt mean Q4, i meant question 10!

Yes, it's ANOVA. So no longer in scope.

 

[Molly]

Yes, it's ANOVA. So no longer in scope.

great thank you so much!

 

[Molly]

Hi John,

sorry me again, could you double check question 8iv in sept 2018 please? i got caught out on the standard deviation formula, and havent seen this in the course notes

 

[Molly]

Hi John,

sorry me again, could you double check question 8iv in sept 2018 please? i got caught out on the standard deviation formula, and havent seen this in the course notes

also april 2017 question 8 part vii c please?

 

[Andrea Goude]

S2018 8iv and A2017 8vii c, standard deviation is assumed knowledge, it is the square root of the variance

 

[Molly]

S2018 8iv and A2017 8vii c, standard deviation is assumed knowledge, it is the square root of the variance

Thank you Andrea, I understand that sd=\sqrt var, i just am having trouble with the logic of how they are obtaining the variance of the multiplied distribtuions

For example
S2017 8vii c
S- total amount on all policies
mean claim amount =100
var of claim amount =20^2

Y- number of claims
E(Y)=195
Var(Y)=308.25

so
E(S)=E(claim amount*Y)=E(meanclaim amount)*E(Y) since indepedent
=100*195 << i undertsand this part

its this part i cant seem to get to an answer for . in my head, we are looking for: Var(S)=Var(claim amount*Y)

the solutions seem to jump to
Var(S)=E(Y)var(mean claim amount)+E(mean claim amount)*var(Y) <<this equation for the variance is the part i dont understand

but where has this equation come from? it seems that this formula for variance is used again in the other question i rasied: S2018 8iv

would really appreciate any help on this.
thanks so much
molly

 

[Andrea Goude]

sorry misunderstood your question, sorry, S2018 8iv and A2017 8vii c are compound distributions, they are out of scope, the formula is on p16 of the Tables, you will use this in CS2.
I will ask John to add these to the list!

 

[Molly]

sorry misunderstood your question, sorry, S2018 8iv and A2017 8vii c are compound distributions, they are out of scope, the formula is on p16 of the Tables, you will use this in CS2.
I will ask John to add these to the list!

ah, that's a relief that they are out of scope, thank you!

 

[stressed_and_depressed]

Should April 2022 Paper A 10 iii be marked as out of scope on the Vault?

It is a question on ANOVA.