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Rule: If the p-value is less than the level of significance alpha, then you reject the null hypothesis. Otherwise, you fail to reject the null hypothesis
In this case, the p value is 0.0010 which is clearly less than the level of significance alpha = 0.05
So we reject the null hypothesis.
This allows us to conclude that the mean prison length is less than 2 years.
Note: the null hypothesis and alternative hypothesis are,
Ho: mu = 2
Ha: mu < 2