Stats- Chapter 1

science of collecting, organizing, summarizing, and analyzing info to draw conclusions or answer questions. (sports stats, education stats, business, medicine, politics)

info collected from individual

entire group of individuals studied

person/object being studied

subset of population selected to be studied

organizing/summarizing data by tables/graphs

use methods from sample, extend to population, measure reliability and answer questions

numerical summary of population

summary value based on a sample of individuals

characteristic of individuals of interest

categorical, label, attribute, characteristic (ex: what's student major? gender? occupation? eye color? age categories? race?)

numerical, arithmetic operations used (ex: age? # of textbooks, # of credits, length of time for activity, batting avg, temp, weight, length)

based on a count (ex: # of people, # of credits, # of shoes)

measurement not countable (ex: weight, miles driven, Qual=SS#, zip code, phone number)

name only, no natural order (qual) (ex: major, political affiliation, gender, race, color)

have order (qual) (ex: age categories, education level)

difference between 2 values is meaningful (ex: no absolute zero, temp, clock time, calendar years)

ratios of values have meaning, absolute zero (ex: length of time 60 sec->15 sec=1/4, # of textbooks, # of credits, physical length)

amount of medicine, level of medicine in capsule

amount of time person takes to have relief

no influence in explanatory or response variable

intentional change in explanatory or response variable

two or more explanatory variables are not seperated

explanatory variable not considered in study

look back in time, at past records

data collected over time