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