Sunday

April 20, 2014

April 20, 2014

Posted by **gina** on Saturday, December 15, 2012 at 4:01pm.

(a) find the critical value for a 95% confidence interval forthe population mean of drill times.

(b) using the 95% confidence interval,estimate the populationmean of drill times.

- statistics please -
**MathGuru**, Saturday, December 15, 2012 at 7:19pmFormula for 95% confidence interval:

CI95 = mean ± 1.96 (sd/√n)

...where ± 1.96 represents the 95% interval using a z-table.

With your data:

CI95 = 8 ± 1.96 (3/√144)

Finish the calculation.

I hope this helps.

- statistics please -
**Anonymous**, Monday, April 14, 2014 at 2:56pmno

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