I have a question I've been working on and I've noticed that my solution differs from the textbook solution. I would have considered it a mistake, but the next 4 questions are similar with the same solution "mistake"?(adsbygoogle = window.adsbygoogle || []).push({});

Aside from not converting the % to 0.885, I am wondering about part b. It says to cut the confidence interval to one third; in the solution they cut it to 2, why is that?

(oddly enough, in the next question, they ask to cut the confidence interval to 1/2 but use 1/3 in the solution)

is there something I am not understanding?

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# T-Distribution and confidence interval)

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