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MATHS - Ch 12 Stats (Samples and Populations (Questionnaires (Questions…
MATHS - Ch 12 Stats
Samples and Populations
Data can be collected through censuses and surveys
The data can be a sample or random.
Questionnaires
Questions can be 'OPEN' or 'CLOSED'
Questions should flow into each other
Introduction remarks should be included
NO slang or jargon
DON'T be vague
Avoid bias and emotional language
Avoid double barrel q's
Don't ask leading q's
Make sure they are understandable
Avoid double negatives
Conclusion
Box Plots
Interquartile range
Range of range (Kinda makes sense)
Skewness
Symmetrically skewed
Just has to be symmetrical
Positively Skewed
Going down in height
Negatively Skewed
Going up in height
Centre of measure
Whether the centre of measure is high or low (Refer to example in note book)
Outliers
Numbers that lie out of the spectrum like...
1,5,6,8,9,10
1 is the outlier
Mean
Average
Median
Middle Number
Mode
Most reoccuring number
Range
What is the range of the number - from what number to what number is it?
