Calculus Made Easy Review from Made Easy Apps at Mathforum Calculus Made Easy at Texas Instruments
Secured by PayPal

Confidence Interval Calculator

Select the Confidence Level:    

All you need to know about Confidence Intervals
 Confidence Interval Formula

Sample 95% Confidence Interval Problem

What is the 95% Confidence Interval of your sample of bowling scores with mean x̄=200 and standard deviation σ=10 and sample size n=100 ?
CI-Setup: x̄ ± z*σ/√(n)
Here, 200 ± 1.96 * 10/√(100)
200 ± 1.96 * 10/10
200 ± 1.96*1
Finally, the 95% Confidence Interval is [198 , 202]
Get it now? Try the above 95% Confidence Interval Calculator a few more times.

Free Online Calculators