A coin tossing example
Suppose we know nothing about coins except that each
tossing event produces a head with some unknown
probability p and a tail with probability 1-p. Our model of
a coin has one parameter, p.
Suppose we observe 100 tosses and there are 53
heads.  What is p?
The frequentist answer: Pick the value of p that makes
the observation of 53 heads and 47 tails most probable.
probability of a particular sequence