Enter the level of confidence for the confidence intervals and the prediction intervals for the predictions.
The 2003 guidelines of the International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH), recommend a confidence level of 95%. A 95% confidence level indicates that if you took many random samples from the population, the confidence intervals for approximately 95% of the samples would contain the mean response of the entire population. Similarly, the prediction interval indicates that you can be 95% confident that the interval contains the value of a single new observation.
From Type of interval, select a two-sided interval or a one-sided bound. For the same confidence level, a bound is closer to the point estimate than the interval. The upper bound does not give a likely lower value. The lower bound does not give a likely upper value.
For example, the predicted mean concentration of dissolved solids in water is 13.2 mg/L. The 95% confidence interval for the mean is 12.8 mg/L to 13.6 mg/L. The 95% upper bound for the mean is 13.5 mg/L, which is closer to the predicted mean.