Confidence Intervals in Statistics: Examples & Interpretation
https://www.simplypsychology.org/confidence-interval.html
Oct 11, 2023 · The formula for a confidence interval is (mean – (z* (std_dev/sqrt(n)), mean + (z* (std_dev/sqrt(n)). So, the confidence interval is (85 – (1.96*(5/sqrt(30))), 85 + (1.96*(5/sqrt(30))) = (83.21, 86.79). For a 99% confidence interval and a sample size > …
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