This preview shows page 1. Sign up to view the full content.
Population
: A set of existing units (people, objects or events)
Variable
: Any characteristic of the population
Census
: An examination all of the population of measurements
Sample
: A subset of the units of a population
Quantitative Versus Qualitative
Quantitative
: Measurements that
represent quantities (Annual starting salary, Gasoline mileage)
Qualitative
: A descriptive category to which a population unit
belongs: a descriptive attribute of a population unit (A person’s
gender is qualitative, Make of automobile)
Population of Measurements
Measurement of the variable of interest for each and every
population unit
Sometimes referred to as an observation (For example, annual
starting salaries of all graduates from last year’s MBA program)
Census
: The process of collecting the population of all
measurements
Sample
: A subset of population units
Descriptive Statistics
Descriptive Statistics
: The science of describing the important
aspects of a set of measurements
Statistical Inference
: is the
science of using a sample of measurements to make generalizations
about the important aspects of a population of measurements.
Random Sample
: Selected so that, on each selection from the
population, every unit remaining in the population on that selection
has the same chance of being chosen
Sample with replacement units can be picked more than once
Sample
without replacement – each units is picked and withheld – cant be
picked more than once customary sampling method. Approximately
Random Samples
In general, must make a list identifying each and every individual
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 04/28/2011 for the course BUS 201 taught by Professor Scottloyd during the Spring '11 term at Rhode Island.
 Spring '11
 ScottLoyd

Click to edit the document details