What is the z-score of X, if n = 135, $\mu =70$, SD = 1, and X =75?

Madelynn Winters
2022-09-18
Answered

What is the z-score of X, if n = 135, $\mu =70$, SD = 1, and X =75?

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asked 2022-05-09

I have a set of 1000 data points. I would like to estimate their mean using a confidence interval. I read somewhere that if the sample size, $n$, is bigger than 30 you should use a t-score, and else use a z-score.

Is that true?

Is that true?

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