The z value for a 99.5% confidence interval estimation is

Answer & explanation:

A confidence interval is an estimated range of a parameter of interest. Confidence intervals are used to indicate the reliability of an estimate. For example, a confidence interval can be used to describe how reliable a search result is.  

In other words, a high confidence interval Z value implies that a survey is more likely to indicate the actual values being presented.

In biostatistics, for example, the Z value can be used in calculations to assess the prevalence of a particular disease and the factors associated with it in a population.

The value of Z, however, is not used as a percentage (like the 99.5% addressed in this question) for calculations. A universal table is used to convert Z values and use them in statistical calculations.

Some examples of Z value conversions can be found in the table attached in this question.

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