Is the question about a mean, a proportion, a standard deviation, or a variance?

1
Is the question about a mean, a proportion, a
standard deviation, or a variance?
Yes
Is the question about a single observation?
Is the question about a standard deviation or
variance?
Is the question about a difference in means?
Is the question about a proportion?
Is the question about a difference in proportions?
Is the question about a mean?
No
No
No
No
No
Yes
No
No
Is the question about a difference in standard
deviations or variances?
Yes
Yes
Yes
Yes
Yes
x
x
Is the question about the probability of events
occurring in a single trial, or the probability
of an event occurring over multiple trials?
Yes
x
Multiple trials
Single trial
Are you looking for the probability of more than
one event occurring?
Are the successes occurring on a per-unit time
basis?
x
x
No
Yes
No
Yes
x
Is the probability of a single success the same
for all trials?
Are you looking for the probability of all the
events occurring together?
Is the occurrence of the event contingent on the
occurrence of another event?
Poisson distribution
Yes
Yes
x
Yes
No
No
No
x
Binomial distribution
Pr(A and B) Pr(A)Pr(B) when A and B are
independent
Pr(A or B) Pr(A) Pr(B) Pr(A and B)
Simple probability
Hypergeometric distribution