Accelerated Life Test Plans - Options
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Stat > Reliability/Survival > Test Plans > Accelerated Life Testing > Options

You can assume a known shape or scale parameter.

You can also enter a confidence level that Minitab will use for all confidence intervals.

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Assume shape (Weibull) or scale (other distributions) is known: Check if you know the shape (Weibull) or scale (other distributions) parameter. This results in a smaller sample size because Minitab assumes that you do not need to estimate this parameter. For the exponential distribution, Minitab assumes a Weibull distribution with shape parameter of one, which is equivalent to an exponential distribution.

Confidence level: Enter the confidence level. The default is 95.0.

Confidence interval: Choose to use one-sided confidence intervals (the default) or two-sided confidence intervals. Use a one-sided confidence interval when you are only interested in either an upper bound or a lower bound on what you are trying to estimate.