Question 598424
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