##### First Statistics Test

What is **descriptive** statistics?

presents information from a data set in a convenient form

What is **inferential **statistics?

makes generalizations from sample data

What is a **parameter**?

describes the population

What is a **statistic**?

only describes the sample of the population

What is quantative data?

numbers

What is qualative data?

not numbers; days of the week or political parties

What is a **simple random** sample?

each sample of same size has an equal probability of being picked

What is a **systematic **sample?

starting point selected and then every ___th is picked from the population

What is **cluster** sample?

population divided into groups called clusters; randomly select from those clusters

What is a **stratified** sample?

dividing population into two+ groups that have same characteristics; pick simple random from those groups

What is a **random** sample?

using chance to select people from population

How do you find relative frequency?

rf = f / total

How do you find Ex?

add sample up

How do you find Ex2?

square each sample then add them up

How do you find (Ex)2

square Ex lol

What does E mean?

sum

What does x mean?

sample mean

What does u mean?

population mean

How do you find someone's grade point average?

multiple the grade value times hour. then add up that answers to divide with the total number of hours.

What is Chebyshev's rule look like?

not mound shaped