AP STATS Chapter 1 : Stats starts here
What are cases?
Cases go by different names depending on the situation. Cases are the rows of data that correspond to individual cases about WHOM
recorder information, whether numbers or units
Data
Subjects (Participants)
Individuals are are experimented on
What is the difference between a population and a sample?
The cases are a sample of cases selected from some large population that we'd like to understand
What are the W's?
Who What (and what in units) When Where Why How
What Is Statistics?
a collection if tools and methods designed to help us understand the world
what is a quantitive variable?
a variable that contains numerical values with measurable units
what is an example of an identifier variable?
an ID, or passport
Experimental Units
animals, plants, websites and other inanimate objects
What do the W's provide?
context
what can go wrong with a statistic experiment?
don't label a variable as categorical or quantitive without thinking about the question you want to answer just because your variables values are numbers, do not assume it is always quantitive always be skeptical
what is an identifier variable?
each individual has a unique value, an individual variable proves who someone is
What is an example of a categorical variable?
eye color, height, weight
Respondents
individual who answer a survey
The units provide meanings for ____
numbers
Why do you have to be skeptical in a stat experiment?
one reason to analyze data is to discover the truth, even if you know the context, the truth could be wrong
In a database, rows are called ___
records
Celsius tell us the ___ of measurement
scale
Give examples of Statistics being used in the real world
statisticians asses the risk of genetically engineered food or new drugs being considered they predict new cases of AIDS by regions of the country they also predict the number of customers likely to respond to a sale in a specific area they help to see whether vitamin C really prevents illness
What are the three simple steps to doing Stats right?
think, show, tell
What are categorical variables?
variables that tell use which group or category each individual belongs to
In one word, what is stats about?
variation
What does the context tell us?
what was measured
