Question

In: Statistics and Probability

What are independent trials, and how do they relate to the definition of probability?

What are independent trials, and how do they relate to the definition of probability?

Solutions

Expert Solution

Explanation:

A sequence of trials are said to be Bernoullian if

(i) there are only two outcomes for each trial ( say a success or a failure)

(ii) Consecutive trials in the sequence are independent

and (iii) probability of success in every trial is a constant (namely p)

It is clear that no trial depends on the previous one here.

Consider drawing of two cards consecutively from a well shuffled deck of cards. Consider the event that cards are both diamonds. If the draw is with replacement the trials are independent ( Bernoullian) . Otherwise they are dependent.

In the former case the probability is ( 1/4) x (1/4)

In the later it is( 1/4) x (12/51)


In Probability we use the term Bernoullian trials for independent trials.

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