Posted by **dell** on Friday, March 19, 2010 at 12:56am.

a study found that the average time it took a person to find a new job was 130 days. If a sample of 36 job seekers was surveyed, find the 95% confidence interval of the mean. Assume the standard deviation of the sample is 12 days.

- statistics -
**MathGuru**, Friday, March 19, 2010 at 9:29am
CI95 = mean + or - 1.96(sd divided by √n)

...where + or - 1.96 represents the 95% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.

Using your data:

CI95 = 130 + or - 1.96 (12/√36)

I'll let you finish the calculation to determine the interval.

I hope this will help.

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