descriptive
set of mathematical procedures used to
A Statistics
statistics a summarizing
organize summarize t communicatesetsof data I inferential
Population StentetsatiEng
all individuals of interest
sample
G individuals selected frompopulation participatein study
Resultsfromsample aregeneralized
variable Acharacteristic condition thatchangesfor differentindividuals
sampling error natural error in sample us population
Experimental methods determine a cause effect between variables
independentvariable dependentvariable
manipulated measured
operational definitions define measurement procedures
discrete variable continuous variable
no overlapbetween o infinite of possible
categories values
Non experimental methods determine any relationshipbetweenvariables
usedwhen no manipulation can occur
1 Nominal scale
quantitativedifference between groups
set of categories organized in a sequence quantitative differencebetweengroups
3 interval scale a test
orderedcategorieswithintervalsof the samesize zero is arbitrary SATscores
4 Ratioscale Temperature
Zeropointismeaningful absolutezero
Frequencydistributions anorganizedtable of
iggy
numberslocatedineachcategory scaleofmeasuremen
x
listingcategories t now
on thescale freque
doesx
Érdered offne
datase
from
highest lowest
Proportion p.ttn
G calculations
x f p f n t p1100
5 te 0300 3 add th
4 1 4 pellioso.io Gf 00 o.ioloos lot whendone
3 2 6 patio0.20 0.2011001 201 multiplying
2 2 8 p 21100.20 0.211001 201
I 21100.20 0.204003201 I
pffop I dregf
all