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?
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?
What does x mean?
What does u 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