2014 unit 1 Maths- Statistics and Number

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NathalieGW
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If you are sitting this exam then feel free to ask me questions or help each other out and if you've done this exam also feel free to join in.
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Aeuronautics
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Statististics and Number for aqa?
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NathalieGW
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(Original post by Aeuronautics)
Statististics and Number for aqa?
Yes, which examboard are you on?
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Aeuronautics
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(Original post by NathalieGW)
Yes, which examboard are you on?
Ocr, my school examboard is ocr
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NathalieGW
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(Original post by Aeuronautics)
Ocr, my school examboard is ocr
So all of your exams are ocr?. How are you with cummulative frequency?
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Aeuronautics
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(Original post by NathalieGW)
So all of your exams are ocr?. How are you with cummulative frequency?
Yes, all of them apart from computer science; that's with aqa.

I find them very easy, do you need help with them?
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NathalieGW
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(Original post by Aeuronautics)
Yes, all of them apart from computer science; that's with aqa.

I find them very easy, do you need help with them?
I'm struggling with stratified samples and unconditional probabilities, those long tree diagrams are a nightmare
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Aeuronautics
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(Original post by NathalieGW)
I'm struggling with stratified samples and unconditional probabilities, those long tree diagrams are a nightmare
If you're on aqa, you can buy the teachers pack for 55 pounds, that will cover everything.

Stratisfied sampling is a basic A* topic, a stratisfied sample first divides the population into groups. Then it takes a simple random sample from each group, the number chosen from each group is the same fraction of the group as the sample size is of the population.

It's really simple, honestly. How are with drawing and interpreting histograms?. Do you know the equation for frequency density?. How about direct and inverse proportion?
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NathalieGW
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(Original post by Aeuronautics)
If you're on aqa, you can buy the teachers pack for 55 pounds, that will cover everything.

Stratisfied sampling is a basic A* topic, a stratisfied sample first divides the population into groups. Then it takes a simple random sample from each group, the number chosen from each group is the same fraction of the group as the sample size is of the population.

It's really simple, honestly. How are with drawing and interpreting histograms?. Do you know the equation for frequency density?. How about direct and inverse proportion?
Frequency density = frequency ÷ class width right? So Frequency = frequency density times class width?. On a histogram, the vertical axis shows the frequency density and always starts from zero.

For appropriate averaged

The median formula is both middle values divided by two if the number of given values is an even number right?

I'm confident with proportionality,

Y=kx, k is the constant of proportionality. So y will always be k times x; e.g if k was 5 and y was 200 then x would have to be 40. If Y was 72 then x would have to be 14.4 as 72 divided by 5 is 14.4.

The ratio between K and X is always the same. In inverse proportionality one value increases at the same rate as the other one.
Thanks for that information, i will invest in the teachers pack for next year.
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Aeuronautics
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(Original post by NathalieGW)
Frequency density = frequency ÷ class width right? So Frequency = frequency density times class width?. On a histogram, the vertical axis shows the frequency density and always starts from zero.

For appropriate averaged

The median formula is both middle values divided by two if the number of given values is an even number right?

I'm confident with proportionality,

Y=kx, k is the constant of proportionality. So y will always be k times x; e.g if k was 5 and y was 200 then x would have to be 40. If Y was 72 then x would have to be 14.4 as 72 divided by 5 is 14.4.

The ratio between K and X is always the same. In inverse proportionality one value increases at the same rate as the other one.
Thanks for that information, i will invest in the teachers pack for next year.
All your formulas are correct and i imagine you can easily rearrange the equations in given circumstance?. how are you with percentage error?.

The teachers pack is far better quality than any textbook and should enhance your ability come examination. I find textbooks and the specificatoon quite inadequate and this a problem in which educational representives need to address.
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