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1st lesson of Stats Textbook - most important to remember the terms.
Population
Whole set of items that are of interest
Census
observes or measures every member of a population
Sample
Selection of observations from a group in a population used to find out information about the population altogether
Ads of a census?
should give a completely accurate result
Disads of a census?
time consuming and expensive
Cannot be used when testing process destroys items
Hard to process large quantities of data
what impact does the size of a sample make on validity of conclusions?
Generally, the larger the sample, the more accurate it is but you need more resources.
What
What tends to be inevitable when coming to a conclusion from samples?
Different samples lead to different conclusions because of natural variations in a population
Sampling units
Individual units of a population
Sampling frame
Numbered or individually named to form it.
Note 
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