Thus one minute the value from the table provides our desired result. If instead, we wanted the value to the left, we can use the properties that the area under the curve is equal to one.
The table provides the probability represented by the area to the right of the z-value. The results end up being the same using the symmetry and other properties of the standard normal distribution.įor example, in the case where we’re using the CRE Primer table and calculate a z-value. And, the table may be to the left or the right of the mean. Some tables have the area to the left of the z-value, some have the area from the mean to the z-value. In the CRE Primer, Appendix X Table III the graphic shows a complete normal curve with the shading of the tail to the right of the z value. What changes is which area the author provides. Often that shaded area is the value provided in the body of the table for a specific z-value.Īs you know, for a given z-value, or distance from the mean in units of standard deviation, the area under the curve or probability is determined. If you noticed, and you should have, there almost always is a small normal curve associated with the table. It seems every author has to create a unique way to tabulate the values. Writing this short how-to article would be really easy if there were only one way to create the table. One of the most basic skills needed for the CRE exam is the ability to correctly read the Standard Normal Table. 5-day Reliability Black Belt ® Live Course.5-day Reliability Green Belt ® Live Course.Root Cause Analysis and the 8D Corrective Action Process course.An Introduction to Reliability Engineering.Reliability Analysis Methods online course.14 Ways to Acquire Reliability Engineering Knowledge.Reliability Engineering Management DRAFT.Innovative Thinking in Reliability and Durability.Equipment Risk and Reliability in Downhole Applications.Musings on Reliability and Maintenance Topics.Metals Engineering and Product Reliability.Product Development and Process Improvement.Rooted in Reliability: The Plant Performance Podcast.
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