### Significance

The results from an experiment are typically described in terms of significance.

The significance expressed as a precise numerical value indicates the probability that the scores really are from two different populations

This probability is also known as the **level of confidence**.

The lowest level of confidence which is accepted by scientists is 5% also expressed as the 0.05 level of probability.

There are three levels which are typically used and they are:

0.05 (5%)

0.01 (1%)

0.001 (.1%)

#### Confidence Interval

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