Posted by mona on Monday, April 25, 2011 at 1:45pm.
Suppose a random sample of 36 is selected from a population with a standard deviation of 12. If the sample mean is 98, the 99% confidence interval to estimate the population mean is

statistics  MathGuru, Monday, April 25, 2011 at 6:39pm
CI99 = mean + or  2.58(sd/√n)
...where + or  2.58 represents the 99% confidence interval using a ztable, sd = standard deviation, √ = square root, and n = sample size.
Substitute what you know into the above formula and go from there.
I hope this will help get you started.
Answer This Question
Related Questions
 statistics  A simple random sample of 60 items resulted in a sample mean of 80...
 Statistics (42)  A simple random sample of 60 items resulted in a sample mean ...
 statistics  A specific study found that the average number of doctor visits per...
 Statistics  Which of the following statements correctly interprets a 95% ...
 Statistics  Calculate the following: a) Determine the sample size necessary to ...
 statistics  Use the given information to find the minimum sample size required ...
 statistics  what are the mean and standard deviation of a sampling distribution...
 statistics  a. A random sample of 25 was drawn from a normal distribution with ...
 sda high  A population has a mean of 200 and a standard deviation of 50. ...
 statistics  1.A magazine reported that 6% of Americans read the news paper ...
More Related Questions