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 ztable, 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 ...
 probs & stats  1. A study of 40 people found that they could do on the ...
 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  A study found that 8to 12year olds spend an average of $18.50 per...
 statistics  The average time in data to process orders received by a metal ...
 statistics  1.A magazine reported that 6% of Americans read the news paper ...
 Statistics  A random sample of 90 observations produced a mean that = 25.9 and...
 Statistics 2  The body temperature of healthy human beings can be assumed to ...
 Math  A random sample of 42 college graduates revealed that they worked an ...
More Related Questions