Confidence Intervals for Means

quantitative datameans standard deviation

small ME

t

df n-1

Normal model

fatter

increase

1.Independence assumption2.Random Sample3.Less than 10% of population4.Nearly normal (check with histogram)

invT(probability, df)

ervaltsample

MetPerformConditions

int1

:

04.31y

717.1)22,95(.* invTt

23

24776.4717.104.31

)56.32,52.29(

ClassworkPg. 556-557 (20, 31, 32)