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.

## Answer this Question

## Related Questions

- Statistics - 1. A study of 40 people found that they could do on the average15 ...
- Statistics - 1. A study of 40 people found that they could do on the average15 ...
- statistics - A sample of 106 golfers showed that their average score on a ...
- Statistics - An opinion poll asks a random sample of 100 college seniors how ...
- Statistics - A random sample of 384 people in a mid-sized city (city one) ...
- Statistics - A random sample of 384 people in a mid-sized city (city one) ...
- statistics - The average time in data to process orders received by a metal ...
- statistics - A sample of 25 different payroll depts. found that the employees ...
- Statistics - A random sample of 90 observations produced a mean that = 25.9 and...
- statistics - An automobile shop manager times six employees and found that the ...