AQA MS1B Wednesday 8th June 2016 Exam Discussion Thread

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?

Pretty sure it just said a measure of spread that you couldn't work out before, so sounds like you'd be okay there

Reply 101

luk3miller

2

Original post by Zedane

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?

Yes that'd be ok.

Reply 102

medic1010101

1

Original post by henrynormski

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.

But then you can change the probability of the events? EG you can add 2 onto each category so I ended up with 150/504 X 149/503 X 68/502 X 67/501

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Reply 103

Browns10

Original post by luk3miller

Yes that'd be ok.

Would SD be acceptable for the spread question ?

Reply 104

gcsekid

2

Original post by Zedane

You are correct

It was 7/40 coz if u looked there was one verrrrry similar to 166.6

Reply 105

Browns10

Grade boundary predictions ?

Reply 106

Maths4ever!

1

Original post by Busted838

So this is what i got. Only one im not sure about is the last bit of 3 i times it by 12 but not sure if it was 6 or 12

1a. 0.959
b. Strong positive corilation between height and arm span

2. Median =26
IQR=2
b. Two things are range and mean
c. Range=45 mean =2.6

3a. 0.352
b. 0.136
c. 0.158
d. 0.791
e. 0.267
f.0.185

4. Y=3.00X + 181
b. Every degree increase =3g increase
c. 385
d. Accurate as small residules

5a. 0.941
b. 0.149
c. 0.792
d.1
e.1522.7
f. 0.841 for each
g.0.993 for mean of the 6

6a. 0.0262
b.0.880
c. 0.101
d.0.891
e.mean=54 var=44.28

7a. (258.67,376.33) remember they gave s you need pop sd for confidence iterval. I think i got sd as 144.something
b.first not valid as mean is less. Second valid as 20%

Marks
1a. 3
B. 2

2a. 1
B.2
C.2
D.3

3a. 9
B.5

4a. 4
B.2
C.1
D.2

5a. 7
B.4
C.7

6a. 2
B.1
C.3
D.4
E.5

7a. 4
B.5

Legend

Reply 107

agradestudent16

1

Original post by Busted838

So this is what i got. Only one im not sure about is the last bit of 3 i times it by 12 but not sure if it was 6 or 12

1a. 0.959
b. Strong positive corilation between height and arm span

2. Median =26
IQR=2
b. Two things are range and mean
c. Range=45 mean =2.6

3a. 0.352
b. 0.136
c. 0.158
d. 0.791
e. 0.267
f.0.185

4. Y=3.00X + 181
b. Every degree increase =3g increase
c. 385
d. Accurate as small residules

5a. 0.941
b. 0.149
c. 0.792
d.1
e.1522.7
f. 0.841 for each
g.0.993 for mean of the 6

6a. 0.0262
b.0.880
c. 0.101
d.0.891
e.mean=54 var=44.28

7a. (258.67,376.33) remember they gave s you need pop sd for confidence iterval. I think i got sd as 144.something
b.first not valid as mean is less. Second valid as 20%

Marks
1a. 3
B. 2

2a. 1
B.2
C.2
D.3

3a. 9
B.5

4a. 4
B.2
C.1
D.2

5a. 7
B.4
C.7

6a. 2
B.1
C.3
D.4
E.5

7a. 4
B.5

ur 5 e and f are wrong. Question e asked about the diffference of the two which was 2.3 and f u had to do ur answer to the power of 6

Reply 108

medic1010101

1

Original post by agradestudent16

ur 5 e and f are wrong. Question e asked about the diffference of the two which was 2.3 and f u had to do ur answer to the power of 6

Mean was also 25.6 for Q2

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Reply 109

TIF141

11

Original post by gcsekid

It was 7/40 coz if u looked there was one verrrrry similar to 166.6

One was 166.67 and 200/1.2 = 166.6666...
I Included it because it said 'at most 200' and I rounded to 2dp, but you wouldn't be wrong to exclude it, I wouldn't've thought. Not 100% sure what I did was necessarily right but I suppose if doesn't change whether or not the claim was valid

Reply 110

Zedane

1

Original post by agradestudent16

ur 5 e and f are wrong. Question e asked about the diffference of the two which was 2.3 and f u had to do ur answer to the power of 6

^^^

Reply 111

Dapperblook22

OP

8

Original post by Busted838

So this is what i got. Only one im not sure about is the last bit of 3 i times it by 12 but not sure if it was 6 or 12

1a. 0.959
b. Strong positive corilation between height and arm span

2. Median =26
IQR=2
b. Two things are range and mean
c. Range=45 mean =2.6

3a. 0.352
b. 0.136
c. 0.158
d. 0.791
e. 0.267
f.0.185

4. Y=3.00X + 181
b. Every degree increase =3g increase
c. 385
d. Accurate as small residules

5a. 0.941
b. 0.149
c. 0.792
d.1
e.1522.7
f. 0.841 for each
g.0.993 for mean of the 6

6a. 0.0262
b.0.880
c. 0.101
d.0.891
e.mean=54 var=44.28

7a. (258.67,376.33) remember they gave s you need pop sd for confidence iterval. I think i got sd as 144.something
b.first not valid as mean is less. Second valid as 20%

Marks
1a. 3
B. 2

2a. 1
B.2
C.2
D.3

3a. 9
B.5

4a. 4
B.2
C.1
D.2

5a. 7
B.4
C.7

6a. 2
B.1
C.3
D.4
E.5

7a. 4
B.5

For the last part of Q3 you times by 6, as you wanted the number of ways of arranging 4 items where two sets of two are the same, so 4C2 = 6.

Reply 112

AmarRPM

13

I found this paper pretty hard, even though I did all the past papers from 2010 onwards. Probably should have done more practice in the few days before the exam to make sure I was confident on all topics. Most likely will have to retake this next year, probably got like a B or C :|

Reply 113

agradestudent16

1

Original post by Browns10

Would SD be acceptable for the spread question ?

What answer did u get for sd?? i did that tooo

Reply 114

luk3miller

2

Original post by Browns10

Would SD be acceptable for the spread question ?

Yes absolutely, that's what I put.

Reply 115

Busted838

2

Yeah sorry thats a typo

Original post by medic1010101

Mean was also 25.6 for Q2

Yeah sorry thats a typo
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Reply 116

Zedane

1

Anyone have any predictions for grade boundaries? It was definetely harder than last years paper imop

Reply 117

Busted838

2

Original post by Dapperblook22

For the last part of Q3 you times by 6, as you wanted the number of ways of arranging 4 items where two sets of two are the same, so 4C2 = 6.

Thanks. I put that first but then change it

Reply 118

Browns10

Original post by agradestudent16

What answer did u get for sd?? i did that tooo

I cant remember but it was definitely correct as I used my graphics calculator

Reply 119

Busted838

2

Original post by agradestudent16

ur 5 e and f are wrong. Question e asked about the diffference of the two which was 2.3 and f u had to do ur answer to the power of 6

Didnt 5e. Say work out the new mean is sd stayed the same and if only 10% were larger than something?

And 5f. Im pretty sure you dont do to the power of 6 only because there was a question in a past paper which was exactly the same as this

AQA MS1B Wednesday 8th June 2016 Exam Discussion Thread

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