MA 275 Chapter Notes - Chapter 1: Ratio Test, Qualitative Property, Observational Study
30 Jan 2017
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Sample data must be collected in an appropriate way, such as through random selection. If sample data is not collected in an appropriate way it will be useless. Parameter: describes some characteristic of a population. Statistic: describes some characteristic of a sample. Quantitative data: consists of numbers representing counts or measurements: ex) the weight of cows. Qualitative data: separate categories that are distinguished by some non- numeric characteristic: ex) sexes of cats. Discrete data; finite number or a countable number (cid:523)natural #"s(cid:524) Continuous data: infinitely many possible values (cid:523)unnatural #"s(cid:524: ex) a cow producing 3. 4547 gallons of milk, ex) # of chicken eggs. Cannot be arranged in an order and should not be used in calculations: ex) colors (makes no sense) Ordinal: arranged in an order, differences between values aren"t meaningful: ex) academic grades: cannot subtract b from a or second minus first. Interval: differences between values are meaningful (cid:523)make sense(cid:524) . does.
