If the probability (P) of an event or outcome is high, we say it is not rare or not uncommon.

**Level of
Significance:**

If the probability (P) of an event or
outcome is high, we say it is not rare or not uncommon. But, if the P is low,
we say it is rare or uncommon. In biostatistics, a rare event or outcome is
called significant, whereas a non-rare event is called non-significant. The ‘P’
value at which we regard an event or outcomes as enough to be regarded as
significant is called thesignificance level. In research, most commonly P value
less than 0.05 or 5% is considered as significant level. However, on
justifiable grounds, we may adopt a different standard like P < 0.01 or 1%.
Whenever possible, it is better to give actual P values instead of P < 0.05.
Even if we have found the true value or population value from sample, we cannot
be confident as we are dealing with a part of population only; howsoever big
the sample may be. We would be wrong in 5% cases only if we place the
population value within 95% confidence limits. Significant or insignificant
indicates whether a value is likely or unlikely to occur by chance. ‘P’
indicates probability of relative frequency of occurrence of the difference by
chance.

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