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December 21, 2014

December 21, 2014

Posted by **HELP** on Sunday, March 7, 2010 at 9:24pm.

- college STATISTICS -
**MathGuru**, Sunday, March 7, 2010 at 10:04pmFormula:

CI99 = mean + or - 2.575 (sd/√n)

Substitute what is given into the formula:

CI99 = 160 + or - 2.575 (40/√80)

I'll let you take it from here. Once you have the interval calculated, you should be able to answer the question in the problem.

I hope this will help get you started.

- college STATISTICS -
**Mary**, Monday, March 8, 2010 at 8:16pmWhat does "or" mean?

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