Math  /  Data & Statistics

QuestionFind the critical value zα/2\mathrm{z}_{\alpha / 2} that corresponds to the confidence level 81%81 \%. zα/2=z_{\alpha / 2}= \square (Round to two decimal places as needed.)

Studdy Solution
Use the standard normal distribution table or a calculator to find the critical value zα/2 z_{\alpha/2} that corresponds to a cumulative probability of 0.905 0.905 .
The critical value zα/21.31 z_{\alpha/2} \approx 1.31 (rounded to two decimal places).
The critical value is:
1.31 \boxed{1.31}

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