Answer:
Following are answer to these question:
[tex]\LARGE H_0: p = 30 \%\\\\\LARGE H_A: p < 30 \%[/tex]
Step-by-step explanation:
Even though researchers try and check whether the real percentage of all companies announcing one or more purchases that year 2000 is less than 30%, the invariant hypothesis therefore becomes as follows:
[tex]\LARGE H_0: p = 30 \%\\\\\LARGE H_A: p < 30 \%[/tex]