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March 14th, 2018, 09:57 PM  #1 
Newbie Joined: Mar 2016 From: Canada Posts: 24 Thanks: 0  What happens in between degree of freedom and t(critical)
If anyone can help me answer this question it would be gratefully appreciated. I have been trying to do practice hypothesis testing questions but I do not understand how to get the t critical. I understand how to extract the information from the question and then how to solve for the degree of freedom [n1+n22], but i do not understand how the t critical is derived from that. Someone please explain this. I have provided the example that I am speaking about in the images attached.

March 14th, 2018, 10:17 PM  #2 
Newbie Joined: Mar 2016 From: Canada Posts: 24 Thanks: 0 
Also, what is the reason that alpha is 0.05?


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