MatLab Confidence interval range

Hi,

I am struggling with a problem. I know how to create a 95% confidence interval and I have the calculated mean and standard deviation, but I have a range of sample sizes. I want to create a 95% confidence interval using the range of 5-500 samples given that the mean is 146.4 and the standard deviation is 3.4785. Can someone help me??? I am getting tripped up by the range part of the code

Answer 1

[Star Strider]

Use the tinv function to calculate the critical values for normally-distributed data with varying sample sizes. (This is in the Statistics and Machine Learning Toolbox, however it is very easy to code if you do not have the Toolbox.)

[Samantha Chin]

What if I don't have any data though? I am just given a mean and standard deviation as well as the range of the sample size

[Star Strider]

I’m not certain what you’re asking.

If you have the mean and standard deviation and the sample sizes you want to calculate the confidence intervals for, that is all you need to use tinv to calculate them.