What is a confidence interval?

A confidence interval is a range of values used to estimate a population parameter with a certain level of confidence, usually 90%, 95%, or 99%.

Why are confidence intervals important?

They help quantify the uncertainty around a sample statistic and provide a more accurate picture of what’s happening in the population.

How do you calculate a confidence interval?

You calculate a confidence interval using the formula: CI = x̄ ± z * (σ/√n), where x̄ is the sample mean, z is the z-score, σ is the standard deviation, and n is the sample size.

What tools can help calculate confidence intervals?

Tools like SurveySparrow, Excel, and online CI calculators make it easy to compute confidence intervals quickly and accurately.

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How to Easily Calculate Confidence Intervals for Your Study