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Chapter 1

# Psychology 2850A/B Chapter Notes - Chapter 1: Statistical Parameter, Statistic

Department
Psychology
Course Code
PSYCH 2850A/B
Professor
Tenk
Chapter
1

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Psych Stats Chapter 1 
Statistics
- Refers to a set of mathematical procedures for organizing, summarizing, and
interpreting information
Population
- The set of all the individuals of interest in a particular study
Sample
- A set of individuals selected from a population, usually intended to represent the
population in a research study
Variable
- A characteristic or condition that changes or has different values for different
individuals
Data
- (plural) measurement or observations
Data Set
- Collection of measurement or observations
Datum
- (singular) is a single measurement or observation and is commonly called a score or
raw score
Parameter
- A value, usually a numerical value, that describes a sample
- A parameter is usually derived from measurements of the individuals in a population
Statistic
- A value, usually a numerical value, that describes a sample
- A statistic is usually derived from measurements of the individuals in the sample
Descriptive Statistics
- Are statistical procedures used to summarize, organize and simplify data
Inferential Statistics
- Consist of techniques that allow us to study samples and then make generalizations
about the populations from which they are selected
Sampling Error
- The naturally occurring discrepancy, or error, that exists between a sample statistic
and the corresponding population parameter 
Correlation Method

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