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)