Hypotheses for 2-Sample Poisson Rate

For 2-sample Poisson rate, the hypotheses are as follows.
Null hypothesis
H0: λ1λ2 = d0 The difference between the population rates of two samples (λ1λ2) equals the hypothesized difference (d0).
Alternative hypothesis
Select one of the following alternative hypotheses.
H1: λ1λ2 ≠ d0 The difference between the population rates of two samples (λ1λ2) is not equal to the hypothesized difference (d0).
H1: λ1λ2 > d0 The difference between the population rates of two samples (λ1λ2) is greater than the hypothesized difference (d0).
H1: λ1λ2 < d0 The difference between the population rates of two samples (λ1λ2) is less than the hypothesized difference (d0).
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