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# AQA Statistics watch

1. (Original post by Final_F)
Yeah I got that I believe! Welcome, by the way.

Standardised unemployment rate is ∑(crude rate*standard pop.)/∑(standard pop.) Right?
Doesn't that just make crude data as standard pop/standard pop= 0
2. just remembered, 4 the 3rd quarter thing i got 125000 (i think)
that ring any bells???!!!
3. Well I got 121,000 - but it was an estimate rite? So it could have been anything around there i think ?
4. (Original post by Final_F)
Yeah I got that I believe! Welcome, by the way.

Standardised unemployment rate is ∑(crude rate*standard pop.)/∑(standard pop.) Right?
Yes i *THINK* so, says in book anyway, but i hope it's right.
5. (Original post by anon123)
Doesn't that just make crude data as standard pop/standard pop= 0
Really not sure, i'll be peeing my pants if it is lol.

Anyways, standard pop / standard pop would = 1?
6. (Original post by Jaswarbrick)
Really not sure, i'll be peeing my pants if it is lol.

Anyways, standard pop / standard pop would = 1?
lol so it wud.
7. (Original post by anon123)
lol so it wud.
Yeah, I thought it was weird when I worked it out, but the answer made sense and I have checked and it's exactly what it says in the book and revision guide.
8. (Original post by IZZY!)
**** it. i wanna shoot myself. I self taught myself, spending 2 hours every day. It feels so **** I ****ed up. I rly wanted a high grade, but now I see it is over. BTw what did u get for standard deviation and mean? I got 180 for mean and something like 30 with something for s.d.
I think i got 180.5 for the mean and like 31.7 for standard deviation. (Round about)
9. (Original post by Jaswarbrick)
I think i got 180.5 for the mean and like 31.7 for standard deviation. (Round about)
Me too!
10. For French question;
390 / 0.78 = 500 students in the school.

In the first part we were asked to fill in the tree diagram.

0.8 probability of being good at French, and 0.2 being bad.

0.8 x 500 = 400 good at French.

Anybody get that?
11. (Original post by cosmopolitan)
i got the same kinda answer for the fish!woooohoooo!
standard deviation is the square root of 1300 i think(i'm not 100%) so that did leave it at 36. something!gothic pixie, i did the same thing as you 4 the median.it was 125 because i distinctly remember lookin 4 da 63rd value. then again i cud be wrong!
to find the median i added 200 (cos it was the lowest value in the grouping where the median was placed) to the product of 10/35 (as 10 values in was where the median was placed, out of thirty five values) and 10 (as this was the class width). i learnt how to do it from a text book last night, so glad i did!but then again it mighnt even be right!
200+(10/35*10)=202.857
i thought 202.857 might be right as the grouping was between 200 and 210, which makes it possible!unlike most of my other calculations!

Glad to hear u did the same...was beginning to wonder if i had gone completely wrong! However, i got a different answer (205.7....) because after finding 10 as a proportion of 35 i figured u needed to work this out relating to the class width, which i thought was twenty...but maybe i'm wrong....therefore i did 10 / 35 times 20 (5.7...) and added it onto 200... is this wrong?
12. (Original post by Gothic pixie)
Glad to hear u did the same...was beginning to wonder if i had gone completely wrong! However, i got a different answer (205.7....) because after finding 10 as a proportion of 35 i figured u needed to work this out relating to the class width, which i thought was twenty...but maybe i'm wrong....therefore i did 10 / 35 times 20 (5.7...) and added it onto 200... is this wrong?
not a clue! if the method we used turns out 2 be right then even if u or i haven't got the answer right,we'll probably get most of the marks 4 method anyway! that is, if we've used the right method!lol

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