H_{0}: λ = λ_{0} | The population rate of occurrence (λ) equals the hypothesized rate of occurrence (λ_{0}). |
H_{1}: λ ≠ λ_{0} | The population rate of occurrence (λ) differs from the hypothesized rate of occurrence (λ_{0}). |
H_{1}: λ > λ_{0} | The population rate of occurrence (λ) is greater than the hypothesized rate of occurrence (λ_{0}). |
H_{1}: λ < λ_{0} | The population rate of occurrence (λ) is less than the hypothesized rate of occurrence (λ_{0}). |