Danny AP Statistics

All items or individuals of interest

Population

Number of items or individuals in the population:

Population size

Subset of population from which data are collected:

Sample

Number of items or individuals in the sample:

Sample size

Symbol for Population size:

N

Symbol for sample size:

n

A study in which data are collected from a sample to answer an investigative question about a larger population:

Statistical study

An item or individual from which data is collected:

Observational unit

A characteristic or attribute that varies between observational units:

Variable

What does a categorical variable take on?

Values that are category names or group labels

What are categorical variables also called?

Qualitative variables

Do categorical variables have an order?

No

Examples of categorical variables:

Left right hand

What does a quantitative variable take on?

Numerical value

Do quantitative variables have an order?

Yes

Types of quantitative variables:

Continuous and discrete

What can discrete variables take on?

Distinct set of values or some specific values

Example of discrete data:

Only whole numbers

What can continuous variables take on?

Any value within an interval

A numerical attribute among the whole population:

Parameter

A numerical attribute among the measured sample:

Statistic

What does a frequency table show?

The frequencies in each category of a categorical variable

What are frequencies also called?

Counts or number of repeatedness

What does a relative frequency table show?

Relative frequencies in each category of a categorical variable

What are frequencies also called?

Proportions or percentage

Are bars of bar charts separated?

Yes

What are bar charts used for?

Categorical variables or discrete quantitative variables