Types of variables
Shapes of distributions
Use of medians and means
Finding random numbers on a scientific calculator
Finding random numbers on a graphics calculator
The difference between two medians (or means)
Computer program output
Does sample size make a difference?
Setting up your investigation
1 Select suitable data
2 Pose an appropriate question and identify the population
3 Define the variables
4 State the purpose and who would find it useful
Describe and compare sample distributions
Compare the centres
Compare the shapes
Compare the positions, sizes and overlaps of the spreads
Describe any unusual features
Making a formal inference about the difference between the medians
Making a formal inference about the difference between the means
Communicate your findings in a conclusion
Writing about statistical inference
Pick the errors
What is the population?
Putting it all together
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