# Shared Flashcard Set

## Details

AP Stats
Vocab in AP Stats
23
Mathematics
08/28/2011

Term
 Statistics
Definition
 Science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions
Term
 Lurking Variable
Definition
 Hidden variable affecting outcome
Term
 Population
Definition
Term
 Individual
Definition
 Person in population
Term
 Sample
Definition
 Subset of the population
Term
 Descriptive Statistics
Definition
 Organize and summarize information
Term
 Inferential Statistics
Definition
 Uses methods that take results from sample, extends them to the population, and measures the reliability of the result
Term
 Double-Blind Experiment
Definition
 Neither doctor nor patient know if patient is in the control or experimental group
Term
 Qualitative Data
Definition
 Data that can be counted
Term
 Quantitative Data
Definition
 Data dealing with characteristics
Term
 Approach
Definition
 A way to look at and organize a problem to find a solution
Term
 Discrete Variable
Definition
 Quantitative Variable with either a finite number of possible values or a countable number of possible values
Term
 Continuous Variable
Definition
 Quantitative variable with infinite possible values
Term
 Placebo
Definition
 Innocuous drug
Term
 Control Group
Definition
 A group used for comparison
Term
 Observational Study
Definition
 Does not show causation (measures characteristics of a population, but does not attempt to manipulate or influence variables)
Term
 Designed Experiment
Definition
 Has treatment and shows causation
Term
 Treatment
Definition
 Something researchers administer to experimental units
Term
 AP Format for Random Sample
Definition
 1. Give everyone in population a number 2. Randomly choose a number 3. The person who matches the number is in the sample 4. Repeats are thrown out 5. The process is repeated until you have enough people in sample
Term
 Stratified Sample
Definition
 Separating population into non-overlapping, homogeneous (individuals are similar in some way) groups called strata then obtaining a simple random sample from each stratum
Term
 Systematic Sample
Definition
 Selecting every nth individual from the population for sample
Term
 Cluster Sample
Definition
 Selecting all individuals within a randomly selected collection or group of individuals  (i.e. separate room into quadrants and say group 2 is the sample)
Term
 Convenience Sample
Definition
 Individuals are easily obtained
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