发布日期 ： 2019-04-29 14:20:27 UTC
分类 ： Algebraic
Confidence interval calculator
Calculate the sample size of the mean, the mean, the standard deviation, and the confidence interval for the given input for the selected confidence level.
Standard deviation, variance online calculator
Use the formula:
\(If (n>=30)\),
\(CI = x ± Zα/2 × (σ/√n)\)
\(If (n<30)\),
\(CI = x ± tα/2 × (σ/√n)\)
Here,
x = average
σ = standard deviation
α = 1 - (confidence level /100)
Z<sub>α/2</sub> = value in the Z-table
t<sub>α/2</sub> = t-value in the table
CI = confidence interval.