This calculator creates a confidence interval for a population mean using the following formula:

Confidence Interval = x +/- z*(s/√n)

where:

• x: sample mean
• z: z-value that corresponds to confidence level
• s: sample standard deviation
• n: sample size

To create a confidence interval for a population mean, simply fill in the values below and then click the “Calculate” button:

Sample mean

Sample standard deviation

Sample size (n)

90% Confidence Interval: (5.896, 28.104)

95% Confidence Interval: (3.770, 30.230)

99% Confidence Interval: (-0.388, 34.388)