1. Confidence Interval

Hi guys...

I cant understand what is CI and why we use it...sb plz explain it to me...

2. Originally Posted by memol
Hi guys...

I cant understand what is CI and why we use it...sb plz explain it to me...
Do you have a textbook or class notes. Refer to the, also Google. If there is anything specific you don't understand, please feel free to ask. Perhaps post a question and show what progress you've made on it and say where you get stuck.

3. Originally Posted by memol
Hi guys...

I cant understand what is CI and why we use it...sb plz explain it to me...
As a high level deinition a confidence interval is a range around a statistical parameter of a sample where you expect a percentage of the sample to fall within.

It is more complex then just this alone. It can be used to do many things, one of which is testing significance.

4. thanX Mr fantastic, here is the part of my lec note that I couldnt understand:
"The Gaussian distribution has the following interesting properties: approximately 68%
of values fall within 1 standard deviation (SD) from ; 95% fall within 2 SD; and 99.7%
fall within 3 SD."

5. At this point my only comment would be, commit this to memory.

6. Originally Posted by memol
thanX Mr fantastic, here is the part of my lec note that I couldnt understand:
"The Gaussian distribution has the following interesting properties: approximately 68%
of values fall within 1 standard deviation (SD) from ; 95% fall within 2 SD; and 99.7%
fall within 3 SD."
68-95-99.7 rule - Wikipedia, the free encyclopedia

68-95-99.7 Rule

http://www.occc.edu/tmurphy/2013notesChapter14.pdf