# Confidence Interval (Possion Dist)

Suppose that 45 workers in a textile mill are selected at randome in a study of accident rate. the number of accidents per worker is assumed to be Poisson distributed with mean $\mu$. The average number of accidents per worker is $\overline{x}=1.7$.
a) Find an approximate one-sided lower 90% confidence limit for $\mu$ using CLT, that is, $(\overline{X}-\mu)/\sqrt{\mu/n}\rightarrow Z \sim N(0,1)$, where $X_i\sim POI(\mu)$
b) Repeat a) using $(\overline{X}-\mu)/\sqrt{\overline{X}/n}\rightarrow Z \sim N(0,1)$.
c)Find a conservative one-sided lower 90% confidence limit for $\mu$ .