Pearson Edexcel A Level Maths - Statistics Summary Sheets
14 views 0 purchase
Course
Statistics - All topics
Institution
PEARSON (PEARSON)
Struggling to keep track of all the key concepts in the Statistics section of A Level Maths? These concise, easy-to-understand summary sheets are designed to help you master the most important topics quickly and efficiently.
What’s included:
- Clear explanations of key statistical concepts ...
PROBLEM SPECIFICATION AND ANALYSIS
What is the purpose of the investigation?
What data is needed?
How will the data be used?
DATA COLLECTION
How will the data be collected?
How will bias be avoided?
What sample size is needed?
PROCESSING AND REPRESENTING
How will the data be ‘cleaned’?
Which measures will be calculated?
How will the data be represented?
INTERPRETING AND DISCUSSING
1 DATA COLLECTION
Types of data Categorial/Qualitative data – descriptive
Numerical/ Quantitative data
Sampling Techniques
Simple random Sampling - each member of the population has an equal chance of being
selected for the sample
Systematic – choosing from a sampling frame - if the data is numbered 1, 2, 3, 4….randomly
select the starting point and then select every nth item in the list
Stratified - A stratified sample is one that ensures that subgroups (strata) of a given population
are each adequately represented within the whole sample population of a research
study.
Sample size from each subgroup 𝑠ize of whole sample × Population of the subgroup
= Size of whole population
Quota Sampling - sample selected based on specific criteria e.g age group
Convenience / opportunity sampling – e.g the first 5 people who enter a Leisure Centre or
teachers in single primary school surveyed to find information about working in
primary education across the UK
Self Selecting Sample – people volunteer to take part in a survey either remotely (internet) or in
person
2 PROCESSING AND REPRESENTATION
Categorial/Qualitative data Pie Charts
Bar charts (with spaces between the bars)
Compound/Multiple Bar charts
Dot charts
Pictograms
1
, Modal Class – used as a summary measure
Numerical/ Quantitative data
Represented using – Frequency diagrams
Histograms
Cumulative Frequency diagrams
Box and Whisker Plots
Measures of central tendency - Mode (can have more than one mode)
- Median – middle value of ordered data
∑ fx
- Mean ∑ or
𝑥 ∑f
n
If the mean is calculated from grouped data it will be an estimated mean
Measures of Spread
- Range (largest – smallest value)
- Inter Quartile Range : Upper Quartile – Lower Quartile (not influenced by extreme values)
- Standard Deviation (includes all the sample )
Finding the quartiles (sample size = n)
n is odd (Data 2, 4, 5, 7, 8, 9, 9)
2 4 5 7 8 9 9
Median
Lower Quartile : middle value Upper Quartile : middle value of data
of data less than the median greater than the median
n is even (Data 2, 4, 5, 5, 7, 8, 9, 10)
2 4 5 5 7 8 9 10
LQ Median UQ
4.5 6 8.5
Lower Quartile : middle value Upper Quartile : middle value
of the lower half of the data of the upper half of the data
2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Unoc0. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $19.00. You're not tied to anything after your purchase.
