Posted by **April** on Thursday, March 26, 2009 at 3:40pm.

The average price for new mobile homes is known to be distributed with a standard deviation of 350. if a random sample of 49 homes resulted in a sample mean of 38500, obtain a 90% confidence interval on the population mean.

- statistics -
**MathGuru**, Friday, March 27, 2009 at 9:19am
Formula:

CI90 = mean + or - 1.645 (sd/√n)

...where + or - 1.645 represents the 90% confidence interval using a z-table, sd = standard deviation, and n = sample size.

Substituting:

CI90 = 38500 + or - 1.645 (350/√49)

Finish the calculation.

I hope this will help get you started.

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