Find the critical value $z _ { \alpha / 2 }$ needed to construct a(n) 99.3% confidence interval.
A) 2.46
B) 2.70
C) 3.59
D) 2.35

Name: Find the critical value $z _ { \alpha / 2 }$ needed to construct a(n) 99.3% confidence interval. A) 2.46 B) 2.70 C) 3.59 D) 2.35
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Question

Quizplus · Accepted Answer

For a 99.3% confidence interval, the area in the tails is 0.7% (100% - 99.3%), so each tail has 0.35%. Looking up 0.35% in the z-table or using a calculator for the z-value gives approximately 2.70.

Find the Critical Value zα/2z _ { \alpha / 2 }zα/2​

Find the Critical Value $z _ { \alpha / 2 }$