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Hello, I am currently studying for an midterm, and am running into a roadblock with some of the concepts concerning hypothesis testing applied to means with two related samples. I am noticing in all of the examples in the textbook that the null hypothesis (mu) is always Ho = 0. Why is it that...

For the past year, I have spent about 4.00$ a day for lunch, give or take a quarter or so. (a) draw a rough sketch of this distribution of daily expenditures (b) if, without looking at the bill, I paid for my lunch with a 5$ bill and recieved 0.75$ in change, should I worry that i was...