SOLUTION: Please help I have been struggling with this problem for the last hour I am so confused on what to do..thank yuo very much Determine the value of the confidence coefficient z (&

Question 490308: Please help I have been struggling with this problem for the last hour I am so confused on what to do..thank yuo very much
Determine the value of the confidence coefficient z (α/2) for the situation below: 1 − α = 0.90 Show All Work

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Determine the value of the confidence coefficient z (α/2) for the situation below: 1 − α = 0.90 Show All Work
---
How you find the answer depends on whether you are using
a z-chart (you can find one online) or some technology
(such as EXCEL or a TI calculator)
---
Here's the way to think about it.
If 1- alpha = 0.90, alpha must be 10%
---
So alpha/2 = 5%
----------------
You want the z-values which have 90% centered on
the mean. That is the same as the z-values which
have a left-tail of 5% and a right-tail of 5%.
---
Those values are -1.645 and +1.645
===================================
Cheers,
Stan H.
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