Using the normal distribution and the z- table prove the critical values of the commonly used confidence coefficient: 90%, 95% and 99% for right– tailed - One - tailed Test (Right) Confidence Coefficient 90% or 0.90 95% or 0.95 99% or 0.99 Level of 10% or 0.10 5% or 0.05 1% or 0.01 Significance Critical Value 1. 28 1. 65 2. 33

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