The 95% confidence interval for average P is calculated as follows:
Term | Description |
---|---|
v1 | 2 * Dtot |
v2 | 2 * (Ntot - Dtot + 1) |
v3 | 2 * (Dtot + 1) |
v4 | 2 * (Ntot - Dtot) |
Dtot | Sum of all the defectives |
Ntot | Sum of all the sample sizes |
The 95% confidence interval (CI) for %defective is calculated as follows:
Term | Description |
---|---|
Average P | The proportion of items in your process that are defective |
The 95% confidence interval for PPM defective is calculated as follows:
Term | Description |
---|---|
Average P | The proportion of items in your process that are defective |
The 95% confidence interval for process Z is calculated as follows:
Term | Description |
---|---|
Inverse cumulative distribution function (CDF) of a standard normal distribution | |
Average P | The proportion of items in your process that are defective |