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Statistics GCSE 2016

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Original post by EverythingGreen
I think it's likely they are going to ask about;
Normal Distribution
Time series (including moving averages)
Spearman's Rank
Histograms
Interpreting data
Maybe Binomial Distribution!


I agree !! Also sampling methods
What is quota sampling ?!
Reply 22
Original post by nisha.sri
I agree !! Also sampling methods


Definitely!
Original post by EverythingGreen
Definitely!


What is quota sampling ?
Original post by himmat
has anybody got any predictions on what might come in the 2016 statistics gcse paper?
Good luck everybody for tommorow hoping for the best!


does anyone know how to do index numbers
Reply 25
Original post by nisha.sri
Same here, I've reviewed all the past papers, reviewed all the topics and now i'm like what do i do. Yeh i agree :smile: How are you revising ?



How are you revising ?

Past papers
Original post by EverythingGreen
Past papers


Same !! How many have you done ?
Original post by nisha.sri
What is quota sampling ?


a non-random sampling technique that divides the population into subgroups and the same amount of people are taken out for example 100 females and 100 males
Reply 28
Original post by nisha.sri
What is quota sampling ?


Quota sampling is when you take pre-specified numbers of the population with certain characteristics (e.g sex, age)

An example would be like choosing 20 boys and 20 girls to do a questionnaire
Original post by nisha.sri
Same !! How many have you done ?


do you know how to do index numbers
Reply 30
Original post by nisha.sri
Same !! How many have you done ?


I've done like 3-4 now lol
Original post by nisha.sri
QUICK QUESTION !!
You know for the trend line and the seasonal moving averages. You know the question ( usually the last part ) it says estimate the .... for 2008 quarter 2. Use your answer to part (d). How do you know whether to add it or take it away ?!
Also another question - when drawing the line of best fit do you draw it through the mean ?


if its all the other 2nd quarters are above the line add it, they normally are above :smile:
Original post by hkirkpatrick
do you know how to do index numbers


Yep :smile: The formula I use isquantity / quantity in base year times 100.
Original post by EverythingGreen
I've done like 3-4 now lol


My teacher has given us all of the past papers so i'm done with all that :smile:

Original post by hkirkpatrick
if its all the other 2nd quarters are above the line add it, they normally are above :smile:


Oh ok thank you
Original post by nisha.sri
Yep :smile: The formula I use isquantity / quantity in base year times 100.


thank you and what about chain base?
Reply 35
Original post by hkirkpatrick
do you know how to do index numbers


Simple Index numbers: (current price/base year price) x100

Chain base index number: (current price/ previous year's price) x100

Weighted index numbers: sum of (index no. X weights)/ sum of weights
Original post by EverythingGreen
Simple Index numbers: (current price/base year price) x100

Chain base index number: (current price/ previous year's price) x100

Weighted index numbers: sum of (index no. X weights)/ sum of weights


I've never seen a question about Weighted index numbers.
Reply 37
Original post by nisha.sri
I've never seen a question about Weighted index numbers.


Neither have I but it's in the spec so better to be safe than sorry 😜
Original post by EverythingGreen
Neither have I but it's in the spec so better to be safe than sorry 😜


True !!
Original post by hkirkpatrick
thank you and what about chain base?


Current price / the previous years price times by 100.
Chain base index number tells you the annual precentage change.

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