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Test the null hypothesis that the means of these two subpopulations of charities (environment and non-environment) are the same, versus a one-sided alternative that the

Test the null hypothesis that the means of these two subpopulations of charities (environment and non-environment) are the same, versus a one-sided alternative that the environment charities have on average lower revenue than the non-environment charities. Use 5% significance level.

I just need an explanation of the null hypothesis

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