Ap Stats Vocab. Ch.1+3

15 terms

statistics

the science of collecting, analyzing, and drawing conclusions from data

descriptive statistics

the methods of organizing and summarizing data

inferential statistics

involves making generalizations from a sample to a population

population

the entire collection of individuals or objects about which info is desired

sample

a subset of the population, selected for study in some prescribed manner

variable

any characteristic whose value may change from one individual to another

data

observations on a single variable or simultaneously on two or more variables

percentile

the percent of individuals that are at or below a certain value

quartile

located every 25% of the data.

symmetrical

refers to data in which both sides are aprox. the same when the graph is folded vertically

uniform

refers to data in which every class has equal or aprox. equal frequency

skewed

refers to data in which one side (tail) is longer than the other side.

uni-modal

refers to data in which one class has largest frequency

bi-modal

refers to data in which the data two classes have the largest frequencies and are separated by at least one other class

multi-modal

refers to data in which more than two classes have the largest frequencies and are separated by at least one other class