Question

请教一道统计题，没看懂什么意思，最好带题的意思的解释和答案讲解，谢谢。题在问题补充内。

A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score, μ, on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate μ. What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 3 of μ? Use the value 23 for the population standard deviation of scores on this subsection.

Answer 1

求随机抽样下最小样本量问题
总样本平均值为μ
95%置信区间
3/μ抽样误差？
标准差为23？

概率统计计算好久不用，还给老师了，过程实在给不出，抱歉了。

追问

主要我就是搞不清哪个3 of μ是什么意思。