Using the z-distribution, the confidence coefficient for the 90% confidence interval is of 1.645.
In this problem, we have a 90% confidence level, hence[tex]\alpha = 0.95[/tex], and the critical value z is the value of Z that has a p-value of [tex]\frac{1+0.9}{2} = 0.95[/tex], so the critical value is z = 1.645.
More can be learned about the z-distribution at https://brainly.com/question/25890103
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