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# Statistics S1B 17/05/2013 Thread Watch

1. Awful.

Thought I'd been given the wrong paper altogether. Didn't finish, couldn't finish it if I was given another 90mins.

Hope you all feel better than I do.
Q1 on June 13 paper we just sat, the standard deviation stays the same after converting °F to ° C right ?????????
so sd= 15.7 or something like that?
Yep standard deviation remians the same as of course does the mean.

Data you have is not altering, just a conversion applied to each number.
3. That venn diagram question was so weird... Never seen 4 events in a venn diagram before... I drew B in the middle, then F, H and C are all linked to B, but F, H and C are mutually exclusive so F, H and C does not overlap. Don't really know what figures are inside B...

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4. (Original post by seajamiet)
I got a - number so i know im wrong and thinking of it i believe it doesnt change as well.
I got a minus number too like -8.something?

Something similar was asked in June 2010 (q2b) and the answer was that the standard deviation does change.
Still doesn't explain our minus answer though
5. Paper was ok but made a few stupid mistakes, what were the probability answers?
6. (Original post by siudesmond2k)
That venn diagram question was so weird... Never seen 4 events in a venn diagram before... I drew B in the middle, then F, H and C are all linked to B, but F, H and C are mutually exclusive so F, H and C does not overlap. Don't really know what figures are inside B...

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Venn diagram?
7. (Original post by EmilyC96)
I got a minus number too like -8.something?

Something similar was asked in June 2010 (q2b) and the answer was that the standard deviation does change.
Still doesn't explain our minus answer though
If all data is multiplied, standard deviation is also multiplied by that same scale factor.
If all data has a number added to it, standard deviation stays the same.
So you're meant to just multiply the standard deviation, not take away 32.

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8. (Original post by EmilyC96)
I got a minus number too like -8.something?

Something similar was asked in June 2010 (q2b) and the answer was that the standard deviation does change.
Still doesn't explain our minus answer though
Yes -8.3 i think.
9. Never want to go to a jewellery store again...
10. If you changed all the fs to cs and recalculated the sd, then you've used the formula but not been efficient. What do you think the examiners would do with that?
11. (Original post by Zebrajess)
If all data is multiplied, standard deviation is also multiplied by that same scale factor.
If all data has a number added to it, standard deviation stays the same.
So you're meant to just multiply the standard deviation, not take away 32.

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Of course! damm thats 2 marks down the drain!
12. (Original post by Zebrajess)
If all data is multiplied, standard deviation is also multiplied by that same scale factor.
If all data has a number added to it, standard deviation stays the same.
So you're meant to just multiply the standard deviation, not take away 32.

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Agreed

The standard deviation Is supposed to change by a factor of 5/9

The minus 32 doesn't affect it

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13. (Original post by siudesmond2k)
That venn diagram question was so weird... Never seen 4 events in a venn diagram before... I drew B in the middle, then F, H and C are all linked to B, but F, H and C are mutually exclusive so F, H and C does not overlap. Don't really know what figures are inside B...

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Yeah I did a diagram with 3 separate rectangles for the 3 mutually exclusive events (F, H, and C) and then an oval going through all three for B.
14. (Original post by suvvie)
Yep standard deviation remians the same as of course does the mean.

Data you have is not altering, just a conversion applied to each number.
That's not right. When in Fahrenheit, the mean was 62 ish. When all the data is converted to Celsius, the values are between 3 and 30 ish, so the mean must change.
This also applies to standard deviation, whist was 19.9 in Fahrenheit, this obviously is too high for values between 3 and 30.

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15. Estimate the value of r with a reason? For the first question

What did you guys get?

I stated it stayed the same as changing unit scaling has no affect

I'm actually debating if I'm
Wrong though 2marks

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16. (Original post by TheUndercoverPanda)
Yeah I did a diagram with 3 separate rectangles for the 3 mutually exclusive events (F, H, and C) and then an oval going through all three for B.
17. (Original post by Son234)
Estimate the value of r with a reason? For the first question

What did you guys get?

I stated it stayed the same as changing unit scaling has no affect

I'm actually debating if I'm
Wrong though 2marks

This was posted from The Student Room's iPhone/iPad App
That's what I got. The relationship between the values is still the same. (I also had half an hour left at the end of the exam, so converted all the values and checked r on my calculator :P )

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18. (Original post by Son234)
Estimate the value of r with a reason? For the first question

What did you guys get?

I stated it stayed the same as changing unit scaling has no affect

I'm actually debating if I'm
Wrong though 2marks

This was posted from The Student Room's iPhone/iPad App
I put that
19. (Original post by Will_Is_Martin)
Never want to go to a jewellery store again...

I'm never going bowling with or without Dave on any day unless Thursday comes before Wednesday.
20. (Original post by Zebrajess)
That's what I got. The relationship between the values is still the same. (I also had half an hour left at the end of the exam, so converted all the values and checked r on my calculator :P )

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Awww thank you for the confirmation! ))

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