Population (definition) - Answers "all" values of interest
Census - Answers Looks at every value
N - Answers Population size
Survey - Answers To take a sample
Sample - Answers A specific number of values form the population (subset)
n - Answers sample size
Types of Samples - Answers -Convenient sample
-Self-selected (volunteer)
-Quota Sample
-Random Sample
Convenient Sample - Answers Easy to obtain
Self-selected (volunteer) - Answers Participants choose o take part (ex. questionnaires, polls,
surveys)
Quota Sample - Answers Making the sample meet the percentages the population
Random Sample - Answers Every single value in the population has the same opportunity of
being selected
Simple Sample - Answers 1-step Ex. drawing names from a hat
Stratified Sample - Answers Several stages or steps of random sampling
Categorical Data - Answers "category" Qulaitative
Ex. gender, class, religion, favorite flavor of ice-cream
*can only belong to one category at a time
*Zip codes--even though its numerical
Quantitative - Answers Measures the quantity numerical average is meaningful
Ex. ages, incomes, distance, heights
Population - Answers Any value calculated from the population are called Parameters