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March 14th, 2018, 08:57 PM   #1
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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+n2-2], 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.
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March 14th, 2018, 09:17 PM   #2
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Also, what is the reason that alpha is 0.05?
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