Prob and Stats Vocabulary
Sample
A subgroup of the population
Cluster Sampling
Based on location and logistics
Qualitative Data
Categorical Data
Nominal Level of Measurement
Category, in-organizable
Self Selected
Chose to be in sample
Discrete Data
Countable
Systematic
Every kth person
Census
Every ten years, a total interrogation
Observational
Gathering information without changing things
Ratio Level of Measurement
Interval with a valued 0
Sampling error
Mistake with statistics due to sample
Non-sampling error
Mistake with statistics not due to sample
Confounding
More than one thing could have caused results
Random
Names in a hat, draw the sample from the hat
Quantitative Data
Numerical data
Parameter
Numerical measurement of a population
Statistic
Numerical measurement of a sample
Interval Level of Measurement
Ordered with differences counting
Ordinal Level of Measurement
Ranking, an order, differences don't matter
Continuous Data
Requires a tool to measure
Experimental
Something was done to the sample
Population
The entire group (all of the scores)
Stratified
Want separate groups: 100 males and 100 females
Convenience
Whoever's convenient to ask