Question: I'm having difficulty in doing number 4, I know it's paired data but not sure how to do the rest. Could someone please show me

I'm having difficulty in doing number 4, I know it's paired data but not sure how to do the rest. Could someone please show me and I will try the next question. My lecturer haven't gone through the hypothesis testing topic yet but I want to get this out of the way so I can do

other subjects. Thank you

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