For my Statistics CA I have to investigate 'how does the number of people cycling to work change?'. I have done my hypothesis, calculations, graphs etc. but I am unsure how to interpret the calculations such as standard deviation and also my graphs (box plots and histograms). I know what they're showing but I don't know how to link it to my hypothesis?
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- Thread Starter
- 05-03-2016 11:38
- 07-03-2016 18:48
Firstly, your hypothesis cannot be question, however it is a statement to which you plan your investigation around to see whether it is true or not. So, rephrase your hypothesis. Doing this will be able you to link the standard deviation back to your hypothesis with ease.
You need to ask yourself:
1. What was the main aim of doing the standard deviation?
Look back at your plan.
2. What does the standard deviation show?
A standard deviation close to 0 indicates that the data points tend to be very close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.
3. What does the standard deviation mean?
It is a quantity expressing by how much the members of a group differ from the mean value for the group.