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April 1, 2015

April 1, 2015

Posted by **tina** on Wednesday, October 5, 2011 at 11:54pm.

Can you show you work please???

- Statisics -
**MathGuru**, Thursday, October 6, 2011 at 12:16pmConfidence interval using proportions:

CI90 = p + or - (1.645)(√pq/n)

...where + or - 1.645 represents 90% confidence using a z-table.

Note: p = 110/250 (convert to a decimal); q = 1 - p; and n = 250 (sample size).

I'll let you take it from here.

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