Find the cutoff value for a test with = 0.01. Find the power with =

Find the cutoff value for a test with α = 0.01. Find the power with λ = 4.0, λ = 7.0, and λ = 10.0. Why does a higher significance level reduce the power?
Consider the data in Exercise 23, where calls arrive at a rate of 3.5/h before posting your phone number on your Web page, but 7 arrive in 1 h on the next day.