The way to interpret this table is as follows: For a test using a 90% confidence level (e.g. α = 0.1), the z critical value is 1.645. For a test using a 95% confidence level (e.g. α = 0.05)

The critical value of a z score can be used to determine the margin of error, as shown in the equations below: 1. Margin of error = Critical value x Standard deviation of the statistic 2. Margin of error = Critical value x Standard error of the statistic The z score, also known as the standard normal probability score, signifies ho See more

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