To calculate a confidence interval, you typically need the following:
1. Sample Mean (xÌ): The average measurement from your sample. 2. Standard Deviation (Ï): A measure of the variability in your sample. 3. Sample Size (n): The number of measurements in your sample. 4. Confidence Level (CL): The probability that the true parameter lies within the interval, commonly set at 95% or 99%.
The formula for a confidence interval for the mean is given by: \[ CI = xÌ \pm Z \left( \frac{Ï}{\sqrt{n}} \right) \] where Z is the Z-score corresponding to the desired confidence level.
