I'm working through a stats textbook and have a question of the form:
You will perform a significance test of H0: μ=25$H_0: μ=25$ based on an SRS of n=25$n=25$. Assume σ=5$σ=5$.
I'm stuck on the 'equals' part of μ=25$μ=25$. Given that we're working in the set of reals, isn't the probability of μ$μ$ equaling 25 zero? (Assume a non-textbook dataset; e.g. the odds of μ=180$μ=180$ for the height of adult humans is zero).
I think what the hypothesis is trying to say is "μ"$μ$ is within bounds dictated by your confidence level, but mean(μ)=25"$(μ)=25$".
The alternate hypothesis is something like "Ha: μ != 25"$H_a: μ \neq 25$, which I know is true for any non-hypothetical dataset.
So, what does "H0: μ=25"$H_0: μ=25$ actually mean?