discrete data
data that is counted
continuous data
Data that is measured
(ex) area of a park is 9.5 acres
What is the difference between a random sample and a simple random sample
With a random sample each individual has the same chance of being selected with a simple random sample all samples of the same size have the same chance of being selected
sample
a set of observations drawn from a population.
Simple random sampling
a sampling method that has the following properties.
?The population consists of N objects.
?The sample consists of n objects.
?All possible samples of n objects are equally likely to occur.
Qualitative data
descriptive information (it describes something)
which level of measurement?
years of election: 1988, 1992, 1996, 2000, and 2004
interval
ranks of scores in a tournament
ordinal
Quantitative data
numerical information (numbers).