Confidence

Description

Calculate the confidence interval for a population mean, using a normal distribution.

double Confidence(double alpha, double std, int size)

alpha

$0<alpha \le 1$ , the significance level used to compute the confidence level.

std

The population standard deviation for the data.

size

$size>0$ , the sample size.

Return the confidence interval for a population mean, or missing value "--" for error.

confidence(0.05, 1.5, 100) = ;  // 0.29399459768101

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