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Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

S1 Help

What's a good S1 book to self teach my self? The Edexcel one doesn't have enough examples? Also i have a couple of questions... one being , how do you know when to interpolate? Finally, how do you find Q1 & Q3 ?

Original post by 3.1415927

What's a good S1 book to self teach my self? The Edexcel one doesn't have enough examples? Also i have a couple of questions... one being , how do you know when to interpolate? Finally, how do you find Q1 & Q3 ?

It may help if you posted qs 1 and 3 :tongue:

:tongue:

OP

No sorry the Quartiles (Upper and Lower)

Original post by 3.1415927

No sorry the Quartiles (Upper and Lower)

Oh my bad dw.
Q1 is the median of the lower half, Q3 is the median of the upper half.
(by half I mean of the dataset)

OP

So, is there a formula to work it out?the same way the median is (n+1)/2

Original post by 3.1415927

So, is there a formula to work it out?the same way the median is (n+1)/2

Q_1:\frac{n+1}{4}

Q_2:\frac{n+1}{2}

Q_3:\frac{3(n+1)}{4}

Though remember this gives you a value, which you then use to find the quartiles

(edited 11 years ago)

Original post by Robbie242

Q_1=\frac{n+1}{4}

Q_2=\frac{n+1}{2}

Q_3=\frac{3(n+1)}{4}

Ahh, there are a variety of different methods.
They're all acceptable but apparently all different :s-smilie:

:s-smilie:

OP

Original post by Robbie242

Q_1:\frac{n+1}{4}

Q_2:\frac{n+1}{2}

Q_3:\frac{3(n+1)}{4}

Though remember this gives you a value, which you then use to find the quartiles

So you don't round the number, you use the number?

Original post by 3.1415927

So you don't round the number, you use the number?

Yes, they will usually ask you to interpolate though, for stem and leaf your likely to get a nice round number

Original post by 3.1415927

So you don't round the number, you use the number?

You can interpolate for grouped data, otherwise its just the given value :smile:

:smile:

Original post by 3.1415927

So you don't round the number, you use the number?

Depends if the data is continuous or discrete

OP

Original post by TenOfThem

Depends if the data is continuous or discrete

If it was continuous?

Original post by 3.1415927

If it was continuous?

Then you can use interpolation for the fractional response

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