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# AQA MS1B Wednesday 8th June 2016 Exam Discussion Thread watch

1. (Original post by SaltandSugar)
I multiplied the 0.00531 for the medical bands last question, by four, probably wrong but I got that number too
You were supposed to multiply by 6, as it was 4 ways of arranging 2 different events, so 4C2 = 6.
2. There weren't 4 different combinations as the denominator remained the same
3. (Original post by luk3miller)
I got 0.123. I got the 0.00513 but then I multiplied it by 4 factorial as there were 4 patients, so 4! different combinations.
I thought it would have been 4C2 because 4 patients but there were 2 pairs of the same patients, therefore 4 ways to arrange 2 pairs
4. (Original post by TIF141)
One of them was exactly 166.67, so was it not 8/40 = 20%?
(Original post by tomdavis.)
No, only the first one was as the means was 381 in euros and 381 does not equal 400

But the second said at most 25% were paying less than 200 euro which is 166.67 pounds, and 7/40 paid less than 166.67 pounds.... Which is 17.5% therefore the claim is valid as 17.5<25
I didn't realise it was 200 euros, so I just said 10/40 less than £200 which was 2.5 . Thought it was a bit of a radon m question...
5. (Original post by henrynormski)
There weren't 4 different combinations as the denominator remained the same
The denominator changed as there were 500 people and 4 were added: /504 X /503 X /502 X /501

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6. (Original post by TIF141)
One of them was exactly 166.67, so was it not 8/40 = 20%?
166.67 * 1.2 > 200, so unfortunately I don't think so.
7. I found this paper pretty so-so... I've been getting 85/90 UMS on past papers, but I'll be lucky to scrape 80UMS on this one. After looking at how Stats papers are marked, I'm confident I'll get a good amount of method marks, but I just found some questions weird and I'm not completely confident in my answers.

(Original post by tomdavis.)
No, only the first one was as the means was 381 in euros and 381 does not equal 400

But the second said at most 25% were paying less than 200 euro which is 166.67 pounds, and 7/40 paid less than 166.67 pounds.... Which is 17.5% therefore the claim is valid as 17.5<25
I got this answer too. I was so grateful Q7, it was a nice question to end the paper after I'd had mixed feelings on the rest of it.
8. (Original post by TIF141)
One of them was exactly 166.67, so was it not 8/40 = 20%?
It said less than 200 euros hence 7/40
9. (Original post by I like cows)
For the last question, both the claims were incorrect, werent they?
both correct i put
10. (Original post by medic1010101)
The denominator changed as there were 500 people and 4 were added: /504 X /503 X /502 X /501

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You are using that tables results for a sample of the dentist for the other patients, so denominator will remain the same
11. (Original post by luk3miller)
166.67 * 1.2 > 200, so unfortunately I don't think so.
200/1.2 = 166.66666666666... So I suppose it depends on whether you interpret that as .67 or .6 recurring
12. (Original post by tomdavis.)
No, only the first one was as the means was 381 in euros and 381 does not equal 400

But the second said at most 25% were paying less than 200 euro which is 166.67 pounds, and 7/40 paid less than 166.67 pounds.... Which is 17.5% therefore the claim is valid as 17.5<25
Did you convert to euros
13. (Original post by henrynormski)
You are using that tables results for a sample of the dentist for the other patients, so denominator will remain the same
I'm not sure. So what exactly did you do?

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14. on a normal distibution one which was about greater than 10% did you just convert 1-0.1 (0.9)-1.2816?
15. I said 7/40 which is 17.5% but everyone is saying 8/40?

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16. (Original post by tomdavis.)
No, only the first one was as the means was 381 in euros and 381 does not equal 400

But the second said at most 25% were paying less than 200 euro which is 166.67 pounds, and 7/40 paid less than 166.67 pounds.... Which is 17.5% therefore the claim is valid as 17.5<25
The mean of the sample was 381 euros. They wanted you to find the mean of all people who exchanged currency, so the population. They wanted you to compare the mean with the confidence interval.
17. (Original post by TIF141)
200/1.2 = 166.66666666666... So I suppose it depends on whether you interpret that as .67 or .6 recurring
In that case They might put in the margin of the mark scheme "allow"
18. (Original post by medic1010101)
I'm not sure. So what exactly did you do?

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Adding 4 to the Deominator makes no sense.

The probabilities are for a pool of 500 patients, so adding 4 will change the probabilities for each event.

You're looking at 4 patients outside the 500 sampled, so you will keep the same denominator. As you don't change the denominator, the arrangement of events won't change.
19. (Original post by sean.17)
In that case They might put in the margin of the mark scheme "allow"
Ah okay, I hope so!
20. Pretty good paper, reckon maybe low 90ums or something like that. Quick question, for the measure the spread question i put range, is that ok instead of sd or variance?

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