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10% Condition
Normal Condition
If sample size is small enough compared to my population then we can proceed as if we have independent samples even when we don’t.
n ⇐ .10 N
Population size
10%
sample size
IF TRUE
then
M
mean
p
= P
all my sample proportions
Population proportion
&
O
p
=
p(1-p)
n
If number of successes and numbre of failures are both >= 10 we consider it Normal
how to find successes and failures: p = rate of success so however big your sample is * p = number of successes np = numbre of successes np >= 10 for successes and n(1-p) >= 10 for failures
IF TRUE: then use Normal calcuations ( z score, table a, normalcdf, normalpdf