S1 questions .

charly2012

Click the file to see the questions . thanks

Edexel Mark scheme June 2001.docx

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Any reply ?

Original post by charly2012

Any reply ?

Q.4

F(-0.4) does not mean F(0), it means exactly what it says.

F(-0.4) = P(X<= -0.4)

The only possible values of X that satisfy that criteria are X= -2 and X=-1, hence the given answer.

Q.3

You need to convert Y to the standardized normal distribution.

Why do you think they would be looking for X?

Reply 3

haroon77

does stats at gcse help in s1 at as level ?

Reply 4

Robbie242

Original post by haroon77

does stats at gcse help in s1 at as level ?

I did no stats at gcse but I'm fine at alevel stats, so no gcse really doesn't help all that much

Reply 5

haroon77

Original post by Robbie242

I did no stats at gcse but I'm fine at alevel stats, so no gcse really doesn't help all that much

so there's nothing like spearman;s rank or standard deviation in s1

Reply 6

Robbie242

Original post by haroon77

so there's nothing like spearman;s rank or standard deviation in s1

Standard deviation comes up in S1, not that its hard though, its just formulas. Spearman's rank sounds more like S3 to me, though not sure. Stuff like correlation coefficient, histograms, frequency tables, probability the usual comes up with a few new chapters like the normal distribution

Reply 7

haroon77

Im surprised at the overlap, except for correlation coefficient, i've seem to have done all the others- are u doing fm by any chance

Reply 8

Robbie242

Original post by haroon77

Im surprised at the overlap, except for correlation coefficient, i've seem to have done all the others- are u doing fm by any chance

Yeah I am... had to self-teach it though due to my crappy maths gcse grade

Reply 9

haroon77

Original post by Robbie242

Yeah I am... had to self-teach it though due to my crappy maths gcse grade

how difficult is it, i should be getting an a in gcse maths

Reply 10

Robbie242

Original post by haroon77

how difficult is it, i should be getting an a in gcse maths

It's very time consuming and quite difficult at times, but it is certainly more handle-able for you than it is for me. I got a B at gcse worked my ass of and got 98ums in c1, so if you work hard you get results, you do nothing you get U's or D's

Reply 11

UKBrah

Original post by Robbie242

You gonna tell the world you got 98 ums aye? :holmes:

Reply 12

yaboy

GCSE results mean nothing as long as you get an A in maths because that is what most mathematical based subjects like maths stats and econ require at gcse along with A or higher at uni. I only got an A in a level (1 ums off A* remark came back the same :frown:

)

Reply 13

haroon77

Original post by Robbie242

Thanks fo the reply, but i was talking abt fm, not maths a level on itself

Reply 14

Robbie242

Original post by haroon77

Thanks fo the reply, but i was talking abt fm, not maths a level on itself

FM is not that much different at AS level, it just more concepts

Reply 15

Robbie242

Original post by UKBrah

You gonna tell the world you got 98 ums aye? :holmes:

examples bro

Reply 16

charly2012

Sorry i am quite confused now , how do you even answer such question :s-smilie:

Reply 17

Robbie242

Original post by charly2012

Sorry i am quite confused now , how do you even answer such question :s-smilie:

For q3 we have mean of 100 and variance of 256

So this can be normally distributed such that: X~N(100,256)

Notice that in the formula

Z=\frac{X-mew}{std deviation}

Where mew is 100 and std deviation is

\sqrt 256 = 16

From here you can say that

Z=\frac{X-100}{16}

X is your random variable from both parts, notice that if you add X 100 cancels out and it leaves you with a K, find the value of z associated with each probability and set it equal to Z where

P(Z<z) or P(Z>z)

Hint: standardise each variable using the formula above

(edited 11 years ago)

Reply 18

charly2012

This is what i done . answer Q3.png

Reply 19

donal008

Can someone help me with one stats 1 question, I am trying to do chapter 5 mixed exercise question 10 and I just cant think about how to do it, please help