Section 1.1 Statistics 190
variable
a measurable characteristic or attribute for an individual, that may differ in numerical value or classification from person to person
statistic
a science where information is collected, organized, summarized, and analyzed
sample
a subset of the entire population
Qualitative variable
a variable that contains a classification system for its variable values.
discrete or continuous ? Length (in minutes) of a country song
continuous
discrete or continuous? temperature on a randomly selected day in Memphis, Tennessee
continuous
Statistic vs Parameter (Statistic definition)
describes a sample
List the process of statistics
determine the research objective, formulate the research question, collect data to answer the research question, describe the date, perform inference on the data
discrete or continuous? Goals scored in a season by a soccer player
discrete
discrete or continuous? points scored in an NCAA basketball game
discrete
Inferential statistics
extending sample results to the population
descriptive statistics
graphical and numerical methods used to describe, organize, and summarize the variable values on variables for a research study
Parameter or Statistic? Ty Cobb is one of major league baseball's greatest hitters of all time, with a career batting average of 0.366. Baseball-almanac.com
parameter
Parameter or Statistic? following the 2010 national midterm election, 12% of the governors of the 50 United States were female. National Governors Association
parameter
Qualitative or Quantitative: cell phone number
qualitative
Qualitative or Quantitative: gender
qualitative
Qualitative or Quantitative: zip code
qualitative
Quantitative or Qualitative? Nation of origin
qualitative
quantitative or qualitative? phone number
qualitative
quantitative or qualitative? Number of unpopped kernels in a bag of ACT microwave popcorn
quantitative
quantitative or qualitative? grams of carbohydrates in a doughnut
quantitative
Parameter or Statistic? A study of 6076 adults in public restrooms (in Atlanta,Chicago, New York City, and San Fransisco) found that 23% did not wash their hands before exiting.
statistic
Parameter or Statistic? In a national survey of 1300 high school students (grades 9-12), 32% of respondents reported that someone had bullied them in school. Bureau of Justice Statistics
statistic
Variable Values
the assigned numerical range or classification system for a variable
population
the entire collection of individuals on whom to collect data for a statistical process
parameter
the numerical summary of a population
Data
the specific variable values measured or counted for the variables of interest in the statistical process
An Act Composite Score is an example of a ______________________
variable
An Act Composite Score is a variable where the possible values range from 1-36
variable values
continuous quantitative variables
variable values are either infinite, or may assume any value between points. variable values are measured, and cannot be counted
discrete quantitative variables
variables values are either finite or may only assume certain values between points. variable values are usually countable
Quantitative variable
variables where the variable values are a numerical range that can be added or subtracted to provide meaningful results
