Data Analysis
You have collected your data and represented it on maps, in graphs and tables and on annotated images. The next step is to analyse your data using a range of appropriate statistical techniques.
 Basic analysis techniques – means, medians, modes.
 Measures of dispersion – Standard Deviation
 Higher Order Statistical Techniques – Spearman’s Rank.
 Alternative Higher Order Stats (Optional)
Complete the sections of the following document to explain and evaluate your progress.
You can alter the document to reflect the work that you have done, but all sections must have something in them!
Add as much detail as you can – make note of things that go badly, as well as things that are successful.
Sample Exam Question:
Evaluate the techniques used to analyse data in an investigation of…(insert topic here).
[10 marks]

Basic numerical analysis
You need to calculate the average of a set of data in order to ascertain whether your data is reliable and shows a marked change or difference from what is “normal”,
Mean: The “average” of a set of data (add the data and divide by the number of pieces of data)
Median: The “central value” of a set of data (put the data in rank order and select the middle value)
Mode: The most “common” value in a set of data (the value that occurs most frequently)
Do your working (on Excel – use of ICT!) and add your values in the table below:

Aim 1 
Aim 2 
Aim 3 
Mean 



Median 



Mode 



Comment on these values (how useful are they? What do they tell you about the data?) Write a paragraph or some bullet points below:
Standard Deviation
This is a measure of the dispersion of your data around a mean value (central tendency). It will give you a measure of how reliable your mean value is. The lower the Standard Deviation, the more reliable your mean (lower values = more centralized data)
Formula for Standard Deviation:
Where:
= the Standard Deviation
= the variable
= the mean of the variable
= the total number in the sample
Do your working (use Excel) and complete the table below:

Aim 1 
Aim 2 
Aim 3 
Standard Deviation 



Comment on these values (how useful are they? What do they tell you about the data?) Write a paragraph or some bullet points below: