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# Edexcel S1 - 15th June, 2016 [Exam Discussion] watch

1. Does S1 have any annoying rules with rounding and significant figures like M1 does (in M1 every answer must be given to 2sf or 3sf).

Most mark schemes say "awrt", is this always the case?
Assuming they dont specify anything in the question, any number of decimal places/sig figs is always accepted?
2. So boring
3. (Original post by 4nonymous)

2. There are a lot of things you can do on your calculator. You can work out:
mean
variance
standard deviation
sum x^2, sum y^2 etc
Normal distribution
Thank you
4. (Original post by 4nonymous)

2. There are a lot of things you can do on your calculator. You can work out:
mean
variance
standard deviation
sum x^2, sum y^2 etc
Normal distribution
how do you work out normal distribution on your calculator? is there a special function or something??
thanks!
5. (Original post by KloppOClock)
Effects of coding on Sxx, Syy & Sxy?

Edit:

Sxx has the same effect as variance

Sxy has the same effect as standard deviation
so if the code was y= x - 20 /100,
sxx and sxy would only be affected by the 100?
would you like... times them by 100?

how does coding effect Sxx, Sxy and Syy im confused
6. (Original post by siamesedaffodil)
how do you work out normal distribution on your calculator? is there a special function or something??
thanks!
If you have the casio fx-991ES plus
press mode 3(stat)
then AC
Then shift 1, 5
The following options will come up
P(
R(
Q(

P( is when you have p(z<?)
R( is when you have p(?<z<0) OR p(0<z<?)
Q( is when you have p(z>?)
7. (Original post by 4nonymous)
If you have the casio fx-991ES plus
press mode 3(stat)
then AC
Then shift 1, 5
The following options will come up
P(
R(
Q(

P( is when you have p(z<?)
R( is when you have p(?<z<0) OR p(0<z<?)
Q( is when you have p(z>?)
thank you!!!!!!!!!
unfortunately i dont have this model calculator
8. (Original post by siamesedaffodil)
thank you!!!!!!!!!
unfortunately i dont have this model calculator
which one do you have?
9. (Original post by siamesedaffodil)
so if the code was y= x - 20 /100,
sxx and sxy would only be affected by the 100?
would you like... times them by 100?

how does coding effect Sxx, Sxy and Syy im confused
http://www.thestudentroom.co.uk/show....php?t=1998116

I don't need the answer to the question, I just need to know what the question says as I have yet to do it and there are weird symbols.

If anyone can send me what the question says that would be appreciated
11. (Original post by KloppOClock)

I don't need the answer to the question, I just need to know what the question says as I have yet to do it and there are weird symbols.

If anyone can send me what the question says that would be appreciated
If I had to guess, it would be and that's it. Maybe you can find an alternative source of the paper?
12. (Original post by SeanFM)
If I had to guess, it would be and that's it. Maybe you can find an alternative source of the paper?
thanks, I would rep you but it wouldnt let me!
13. Hi guys! Does anyone know the answer to this?

Is the sd affected by multiplication or addition
Is the mean affected by multiplication or addition
14. (Original post by Aliceeee12)
Hi guys! Does anyone know the answer to this?

Is the sd affected by multiplication or addition
Is the mean affected by multiplication or addition
both are yes
15. Thanks!
16. Hey, im trying to do a question about mean/standard deviation but just can't get my head around it. It's S1 June 2013 (R), Q3)E).

I just don't get what I'm meant to do. I've haven't attempted it because i dont know where to start . any help would be appreciated
17. How many distributions do we need to know?
18. (Original post by JT423)
Hey, im trying to do a question about mean/standard deviation but just can't get my head around it. It's S1 June 2013 (R), Q3)E).

I just don't get what I'm meant to do. I've haven't attempted it because i dont know where to start . any help would be appreciated
Its asking for the number of tomato plants with a yield of more than1 standard deviation above the mean so:
mean + 1 standard deviation= 18.3 (based on answer to part c)

18.3 lies in the group 15<y<25
so the number of plants >18.3
= (upper yield - calculated yield)/ class width * frequency
(25-18.3)/10 *12 = 8.04
you then add the 4 for the next group also as they clearly have a yield >18.3
so total is 12.04 so 12 plants
19. (Original post by 4nonymous)
Its asking for the number of tomato plants with a yield of more than1 standard deviation above the mean so:
mean + 1 standard deviation= 18.3 (based on answer to part c)

18.3 lies in the group 15<y<25
so the number of plants >18.3
= (upper yield - calculated yield)/ class width * frequency
(25-18.3)/10 *12 = 8.04
you then add the 4 for the next group also as they clearly have a yield >18.3
so total is 12.04 so 12 plants
Thanks for this, it was very useful and cleared a few things up. However, i dont understand why you used the upper yield- calculated yield? is that interpolation?
20. jan 16 ial - any copies available?

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