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Edexcel S1 - 15th June, 2016 [Exam Discussion]

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Original post by SeanFM
Think of definitions and what points on box plots represent.


So Q1 = 30 therefore its 30 for A and for b Q3 = 46 so its 46 for B?
Original post by imran_
show ur working please


so I worked out how many people between 1.5 and 3.5
so 1.5 + ?/15*3 = 3.5
rearrange for ? = 10
but you want above 3.5 so 15-10=5
Then you will also include the 9 in the next group as they are between the time limit

Then interpolate again to find those between 6.5 and 7
so 6.5 + ?/6 *1 =7
?=3

5+9+3=17

Not sure if you're gonna understand this method but that's how I do it.
Original post by not_lucas1
So Q1 = 30 therefore its 30 for A and for b Q3 = 46 so its 46 for B?


See, you knew how to answer them already :borat:
For the equation y = a + bx what does a represent? is it the y intercept ?
Which is the hardest S3 paper??
for jan 2009 Q4a why don't you use n/2 to calculate the median etc
The answers were:
Q2=53
Q1=35
Q3=60
Do we need to know about explanatory variables????
Original post by not_lucas1
For the equation y = a + bx what does a represent? is it the y intercept ?


of the regression line yes
Original post by ChilliLemon
Do we need to know about explanatory variables????


Yes, they often come up
Original post by tazza ma razza
Wicked Mate - see you at Warwick next year :wink:


Hopefully not. :tongue:
Original post by SANTR
Ok, suppose the value was 0.8010 and not on either table, how would you determine the Z value?


Using the normal table...
Original post by 4nonymous
so I worked out how many people between 1.5 and 3.5
so 1.5 + ?/15*3 = 3.5
rearrange for ? = 10
but you want above 3.5 so 15-10=5
Then you will also include the 9 in the next group as they are between the time limit

Then interpolate again to find those between 6.5 and 7
so 6.5 + ?/6 *1 =7
?=3

5+9+3=17

Not sure if you're gonna understand this method but that's how I do it.


Yes, a third of the first bit, all the second, then half of the 6.
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SANTR
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Original post by Zacken
Using the normal table...


But 0.8010 isn't on the table, there's 0.7950 or 0.8023?
Original post by Mr T Pities You
Yes, a third of the first bit, all the second, then half of the 6.


lol. I managed to get the right answer at least and I've done a similar type question using the same method and it worked
Original post by SANTR
But 0.8010 isn't on the table, there's 0.7950 or 0.8023?


Whichever is closest. However, the exact reason you don't get asked for those values is because they're not on the table.
Anyone kind enough to give me the link to S1 IAL jan 15 paper?
(edited 7 years ago)
Original post by mollie1711
I'm having a last minute panic about quartiles, if n/4, n/2 etc is a whole number eg 5 would you use 5.5th number?


Yep, and if you get a decimal round up and use that value.
Original post by SANTR
But 0.8010 isn't on the table, there's 0.7950 or 0.8023?


round to the nearest one so use the z value for whatever 0.8023 is
Original post by SANTR
But 0.8010 isn't on the table, there's 0.7950 or 0.8023?


Not quite sure if you understand how the tables work, I think you should try figure out a way of using them that works for you, maybe a bit late now :tongue:
Original post by Mr T Pities You
Yep, and if you get a decimal round up and use that value.


So if the Q is a whole number you add 0.5 and use the mean of the values its between? and if its a rational number you round it and use that specific number?

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