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Unformatted text preview: yes no √
¯
X ± zα/2 s/ n known? normal or
not too different
from normal the population
distribution is small (n≤30) is exact if the population distribution
Note:
is normal, even if n < 30. √
¯
X ± tα/2,n−1 s/ n ¯ ± zα/2 σ /√n
X is large (n>30) no small p ± zα/2
ˆ √
p(1 − p)/ n
ˆ
ˆ large:
np, n(1 − p) > 10
ˆ
ˆ adapted from Freedman, Pisani, Purves "Statistics" consult a statistician quite different
from normal stat 101 the amount of data is yes add two "yes" and
two "no" outcomes
and then use ... are we talking about proportions? the amount of data is Conﬁdence Intervals ...
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This note was uploaded on 04/04/2012 for the course STAT 101 taught by Professor Heller during the Fall '08 term at UPenn.
 Fall '08
 Heller
 Statistics

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