The title of the question does not name the model. Start with the checklist (what X counts or measures, the data, what is asked) and follow the questions down to the rule.

1Is there a variable X, or only events (groups, “and”, “or”, “given that”)?

only events, over the total

⟦1⟧

“given that”, “among those who”, known outcome → cause

⟦2⟧

two variables in the same draw

⟦11⟧

one variable X

go on to question 2

2Is the table of X already given, value by value?

yes

⟦3⟧

no

Does X count (0, 1, 2, ...) or measure (time, weight, length)?

3X counts: how do the trials happen?

fixed n, with replacement or independent, same p

⟦4⟧

fixed n, without replacement, small group

⟦5⟧

until the 1st success

⟦6⟧

rate per time, area, or length, no n

⟦7⟧

4X measures: what does the text give?

mean and standard deviation, bell shape

⟦8⟧

interval [a, b], all equally likely

⟦9⟧

time until the next one, rate or mean

⟦10⟧

!Neighboring pairs: the clue that tells them apart

if the text says	it is	and not
without replacement, small lot	hypergeometric	binomial
until the first	geometric	binomial
how many in one hour	Poisson	exponential
how long until the next one	exponential	Poisson
equally likely on the interval	uniform	normal
among those who, given that	conditional	joint

⟦i⟧

Distribuição Binomial

Caixa de ferramentas

Folha de exercícios