Population
The whole group you want to find out about
Sample
A smaller group from a population
What should the sample do
Fairly represent the whole population
Why should the sample fairly represent the whole population
It allows you to apply any conclusions from your survey to the whole population
What makes a sample more representative
-Random sample
-Large sample
Biased sample
Sample that doesn’t properly represent the whole population
Qualitative data
Descriptive, uses words, not numbers
Quantitative data
Measures quantities using numbers
Discrete data
Data that can only take exact values (whole numbers)
Continuous data
Data that can take any value in a range (can be decimal)
Grouped discrete data
Numbers separated by hyphen -
Grouped continuous data
Data separated by an inequality symbol
Mode
Most common value
Median
Middle value when values are in order of size
Mean
Total of items/number of items
Range
Difference between the highest and lowest
Frequency Density
Frequency/class width
