poisson mean exact confidence interval

Can I find the exact confidence interval for a poisson distribution using Chi-Square method, where we take the degree of freedom as 2*x at (alpha/2) and 2*(x+1) at (1 - alpha/2), and divide each chi square result by 2?

Thank you.

 

Urgent here as well!!!

 

Any guidance here??

Thank you

 

Exact confidence interval is always found using probabilities of original distribution, which is Poisson in this case.

 

Thanks!