Confidence Interval 90 z Score
What is the Value of Z for a 90 Confidence Interval?
1
A confidence interval has two tails a right and a left.
But the z-curve is designed with only a left tail. So a 90% confidence interval will use the same z-score as 95% of the data.
z-table source : Want to Pass Your Six Sigma Exam the First Time through? | Six Sigma Study Guide
0.95 is exactly between the z-scores of 1.64 and 1.65, so I will estimate the z-score as 1.645.
The z-score associated with a 90% confidence interval is 1.645.
But the z-curve is designed with only a left tail. So a 90% confidence interval will use the same z-score as 95% of the data.
z-table source : Want to Pass Your Six Sigma Exam the First Time through? | Six Sigma Study Guide
0.95 is exactly between the z-scores of 1.64 and 1.65, so I will estimate the z-score as 1.645.
The z-score associated with a 90% confidence interval is 1.645.
2
The critical z-value for a one-sided 90% CI is 1.28 and the critical z-value for a two-sided 90% CI is 1.645.
Top Answer:
The top answer is number 1.
Note
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