SOLUTION: Smith Widget Company makes widgets for the medical industry. One particular customer requires widgets that meet FDA standards. One FDA standard requires Z-testing of at least 100

Question 254451: Smith Widget Company makes widgets for the medical industry. One particular customer requires widgets that meet FDA standards. One FDA standard requires Z-testing of at least 100 widgets at a time at the .08 level of significance. The specific standard requires that widgets be no smaller than a certain tolerance and no larger than a certain tolerance. The critical value(s) for such a test would be: __________
Based on my calculation the z value would be -1.7597 for a 2-tail test. Can you confirm whether this is correct?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Smith Widget Company makes widgets for the medical industry. One particular customer requires widgets that meet FDA standards. One FDA standard requires Z-testing of at least 100 widgets at a time at the .08 level of significance. The specific standard requires that widgets be no smaller than a certain tolerance and no larger than a certain tolerance. The critical value(s) for such a test would be: __________
Based on my calculation the z value would be -1.7597 for a 2-tail test. Can you confirm whether this is correct?
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Using a TI calculator I get: z = invNorm(0.96) = 1.7506861...
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If you use a T-value I get: invT(0.96,99) = 1.7688422....
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Cheers,
Stan H.
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