Significance Level (alpha = _)
The level in which we are allowed
to reject the null hypothesis.
Who decides the level?
The researcher
By convention, alpha is normally
set to _ = .05
Probability value (p value)
The likelihood of an observed
statistic occurring on the basis
of the sampling distribution.
If P value is less than alpha (p < .05)
Reject null hypothesis
If P value is greater than alpha (p > .05)
Fail to reject null hypothesis
Statistically
Significant
Statistically
nonsignificant
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