Unlock the power of statistical inference with our 90% Confidence Interval Calculator. This tool helps you estimate the true population mean from your sample data, providing a range within which the population parameter is likely to fall. Understand your data's reliability and make informed decisions effortlessly.
Formula:
The formula for a 90% Confidence Interval (CI) for the population mean (μ) when the population standard deviation is unknown and sample size is sufficiently large (using Z-score approximation for t-score) is:
CI = x̄ ± Z * (s / √n)
Where:
- x̄: Sample Mean
- Z: Z-score for 90% confidence (approx. 1.645)
- s: Sample Standard Deviation
- n: Sample Size
- √n: Square root of the Sample Size