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AQA Stats...How'd everyone find it?

I thought it went well actually, better than I'd expected. I got something like -0.8 for the Spearman's rank, and 50-something for the standardised unemployment rate. I think I got 70ish for the crude unemployment rate though, but it was this morning so I can't really remember! I know I got a couple wrong but I really hope I get at least an A. The grade boundaries are usually quite high for stats - maybe 78ish for an A and around 90 for an A*?

Reply 21

Ribulose Bisphosphate

OP

2

I also got 4.61 for the standard deviation!!! Thank God!

I was really confused with what was 'f' and what was 'x' with their table...YAY!!! (I know how ou lot got 24...it's by doing f and x the other way around...so i dunno who's right now)

I got all the other same answers as you lot (hopefully they're correct)!!!

The A* boundary has been:

93/120 in 2003
97/120 in 2004
86/120 in 2005

I think our paper was harder than the one in 2004 but easier than the one in 2005...so I think the boundary this year will stand at approximately 92/120...or I'm hoping so anyway!!!

Speaking to you guys has really made me feel more confident about how I done...Thanks...

What did everybody write for that rubbish about two types of scale (it was worth 4 marks - 2 for each type)...?

Reply 22

schizoFan

The scales question was a bit :rolleyes:

.... I only remember doing opinion scales in class! I put 1/ Opinion scales - draw a line numbered 1 to 5 so that respondents can show how strongly they agree with the statement. (1 being very satisfied with statement 5 being very unsatisfied)... then I kinda made the second one up :biggrin:

What did people get when they asked you about the skewness of the ceramic workers and they gave you that formula? I got 0 for females and 0.47 for the males... anyone else get the same?

Reply 23

Aj@y

What did everybody write for that rubbish about two types of scale (it was worth 4 marks - 2 for each type)...?

Oh that question sucked, I put use a 5 point scale so that people can give 3 if their opinion is neutral, I remembered it of a past paper. Anyway it was a complete guess and I'm only hoping for 1 or 2 marks for it.

I got 0 for females and 0.47 for the males... anyone else get the same?

Hey I got that too I wrote zero in at the very last second, I'm glad they gave the formula otherwise I would have been screwed.

Reply 24

Yuanfen

And for the distributions question, when they asked what percentage of workers earned more than £52, I worked out that 52 was 4 standard deviations away from 44 (standard deviation was 2) and so put 0%. What did everyone else get?

For the increase in 2 cars, the mean goes up by 2, and the standard deviation doesn't change at all, since the S.D. is a measure of spread, and the shape of the distribution is the same as before, only everything is higher.

I started pouring forth a nosebleed in the middle of question 3, had my hand up for what seemed like an age before a teacher noticed me and took me to the toilets...mmm, I love the smell of blood in the morning... :tongue:

even so, going extra slowly with a pile of tissues next to me (when I finished the first torrent of bleeding I still kept dripping randomly, eugh), I finished 1/2 hour before the end, but everyone always seems to finish an hour or so before the end on these papers...

Reply 25

MadPotta

i thought the standard deviation question was really mean as it was ambiguous which of the two factors was the f and which was x. took me several minutes of racking my brains to come up with a guess for that.

Reply 26

Ribulose Bisphosphate

OP

2

Yeah...I got the same as you lot for the skewnes...the values for males and females...but when you had to interpret them I put positive skew and then for the one that was 0...i put symmetrical...is that right? or did you have to put uniform?

Reply 27

Aj@y

Yeah...I got the same as you lot for the skewnes...the values for males and females...but when you had to interpret them I put positive skew and then for the one that was 0...i put symmetrical...is that right? or did you have to put uniform?

Yeah I think it was symmetrical distribution, but by the time i figured it out i was on my way home from school, nevermind.

Reply 28

Bethrice

6

mAnIaC

...what did people put for the probability of none of the 5 things missing...or something like that...

You had to use the binomial distribution thingy. Then do one take away your answer... I got 0.89, which sounded realistic.

Binomial Distribution...

n!/((n-x)!x!) * P^x * (1-P)^n-x

n= total number of things (eg total of 75 packages)
x= Number chosen (eg 5)
P= probability (eg 1/10)

Reply 29

Ribulose Bisphosphate

OP

2

"Bethrice"...what question are you talking about???

Reply 30

MarcD

12

Bethrice

You had to use the binomial distribution thingy. Then do one take away your answer... I got 0.89, which sounded realistic.

Binomial Distribution...

n!/((n-x)!x!) * P^x * (1-P)^n-x

n= total number of things (eg total of 75 packages)
x= Number chosen (eg 5)
P= probability (eg 1/10)

Hmmm??? How did you end up with 0.89? After using binomial, you should have ended up with 0.9^5. How did the calculation go for you?

Reply 31

Ribulose Bisphosphate

OP

2

exactly...I put (0.9)^5 which gave me like 0.59... it was binomial but you never really needed to use binomial...it was more common sense (1-0.1) ^ 5 (because it is for 5 things)...does anyone agree??? like i mean i never did the expansion (although i thought of it)...because you only needed to do the
(q)^5 bit it's not as if you needed to use a bit in the middle of it!

AQA Stats...How'd everyone find it?

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