LECTURE 1 NOTES
STATISTICS is the science of data. It involves collecting, summarizing, organizing, analyzing, and interpreting data.
DATA is a set of observations, measurements, or facts.
QUANTITATIVE DATA are numbers that occur in a natural and obvious way.
QUALITATIVE DATA are not natural numbers and are usually categories.
A POPULATION is a set of units that we are interested in studying.
AN EXPERIMENTAL UNIT is an object that we are interested in.
A VARIABLE is a characteristic or a property of a population unit.
A SAMPLE is a subset of the population units.
A REPRESENTATIVE SAMPLE shows characteristics typical of the target population.
A RANDOM SAMPLE is one where every unit of the population has an equal chance of being selected.
DESCRIPTIVE STATISTICS uses graphs and numbers to find patterns and to summarize and present information contained in
a data set.
INFERENTIAL STATISTICS uses sample data to make generalizations about a larger set of data whic