Posted by Fakaapo. Suetusi on .
If the confidence interval obtained is to wide. How can the width of this interval be reduce and which alternative is the best and why?
Thank you for your help

Please can you help me (Statistic)) 
PsyDAG,
The only thing I can think of is increasing the size of the sample.

Please can you help me (Statistic)) 
Anonymous,
You could also think about changing the type 2 error.

Please can you help me (Statistic)) 
Anonymous,
Sorry, I meant to write type 1 error (or alpha level).