Posted by **tristen** on Monday, June 18, 2012 at 3:02pm.

11. A local health care company wants to estimate the mean weekly elder day care cost. A sample of 10 facilities shows a mean of $250 per week with a standard deviation of $25. What is the 90 percent confidence interval for the population mean?

- statistics -
**MathGuru**, Monday, June 18, 2012 at 5:28pm
Use a confidence interval formula:

CI90 = mean ± 1.645(sd/√n)

...where ± 1.645 represents the 90% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.

Plug your data into the formula to calculate the confidence interval.

I hope this will help get you started.

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