Before we can talk about testing we have to learn what a distribution is.
And then this lesson will do just that.
In statistics when we use the term distribution we usually mean a probability distribution good examples
or the normal distribution the binomial distribution and the uniform distribution.
All right let’s start with the definition.
A distribution is a function that shows the possible values for a variable and how often they occur.
Think about a fair die.
It has 6 sides numbered from 1 to 6.
We roll the die.
What is the probability of getting one.
It is 1 out of 6.
So 1 6 right.
Easy.
What is the probability of getting 2.
Once again one sixth.
The same holds for 3 4 5 and 6.
We have an equal chance of getting each of the 6 outcomes.
Now what is the probability of getting a 7.
It is impossible to get a 7 when rolling a single die.
Therefore the probability is zero.
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