Basics
Observations that have been collected
What is Data?
Height,Weight,Age
What is Quantitive?
What is Discrete?
Each member of the population has equal chance of being selected.
What is Random Sampling?
To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day.
What is Convenience?
Complete collection of all elements under study
What is Population Data?
Gender, Religion, Jersey numbers
What is Qualitative Data?
What is Nominal Data?
Select some starting point then select every kth element in the population.
What is Systematic Sampling?
An education researcher randomly selects 48 middle schools and interviews all the teachers at the school.
What is Cluster?
Subcollection of the members from the population
What is Sample Data?
Number of people, Number of cars, Grade Letters
What is Discrete Data?
What is Ordinal
Select elements from the population which are easiest to get data from.
What is Convenience Sampling?
A tax auditor selects every 100th income tax return that is received.
What is Systematic?
Numerical measurement calculated from population data
What is Parameter?
Difference between two measurements can be quantified.
What is Interval Data?
Subdivide the population into different subgroups then draw the simple random sample from them.
What is Statrified Sampling?
A market researcher randomly selects 300 drivers less than 25 years of age and 400 drivers over 25 years of age.
What is Stratified?
Numerical measurement calculated from sample data
What is Statistic?
Has a natural zero as starting point.
What is Ratio Data?
Subdivide the population into different subgroups, then draw clusters as sample and collect data from all elements.
What is Cluster Sampling?
A pollster uses a computer to generate 420 random numbers and interviews the voters corresponding those numbers?
What is Random?