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Find the critical value zα/2 needed to construct a 79% confidence interval.

Find the critical value zα/2 needed to construct a 79% confidence interval.

Math   Statistics-And-Probability   
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Answer #1

Solution:

c = 79% = 0.79

= 1- c = 1- 0.79 = 0.21

  /2 = 0.212 = 0.105

1- (/2) = 1 - 0.105 = 0.895

Search the probability 0.895 in the Z table and see corresponding z value

  = 1.254 or nearly 1.25

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