# Confidence Interval

posted by .

Hi,

I need some help with a problem. Here is my example that I am studying.

Find a 95% C.I. for the population mean.
Same size 36
N(u, 64)
sample mean 51.8

51.8+-(4/3)(1.96)

Where does the 1.96 come from? 4/3=64/36 so I understand that.

Thanks

• Confidence Interval -

Never mind. Figured it out.

## Similar Questions

1. ### Stats

It is known that the amount of time needed to change the oil in a car is normally distributed with a standard deviation of 5 minutes. A random sample of 100 oil changes yielded a sample mean of 22 minutes. Compute the 99% confidence …
2. ### Word Problem

Given a normally distributed population, find a 95% confidence interval for the population mean; sample mean is 119; sample std deviation is 14; sample size is 28
3. ### statistics

what are the mean and standard deviation of a sampling distribution consisting of samples of size 16?
4. ### Statistics

In a study to estimate a population mean, i start with a sample size 10 and calculate the 95% confidence interval. Suppose i am not satisfied with the size of the confidence interval and want to reduce it by half. Give an estimate …
5. ### Statistics

Which of the following statements correctly interprets a 95% confidence interval on a population mean?
6. ### statistics

A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a sample …
7. ### Statistics

If someone gives you a sample mean and a standard deviation, you can find a confidence interval. But what if someone gives you the confidence interval instead and asks you to find the sample mean?
8. ### Statistics

Suppose x has a mound-shaped distribution with sigma = 9 . A random sample of size 36 has sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m?
9. ### Statistics (42)

A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was …
10. ### Economics (41)

A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was …

More Similar Questions