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MatLab Confidence interval range

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Samantha Chin
Samantha Chin 2019-12-7
评论： Star Strider 2019-12-7
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

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回答（1 个）

Star Strider
Star Strider 2019-12-7
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.)
  2 个评论
Samantha Chin
Samantha Chin 2019-12-7
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
Star Strider 2019-12-7
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.

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