Acookie company manufactures large sugar cookies that have an average weight of 65 grams. the company wants to know if a machine in their factory is working properly, producing cookies to specification (not too large or not too small), so they will test the hypotheses: h0: μ=65 vs. ha: μ≠65 which of the following is not a necessary condition for a hypothesis test based on this data to be valid? select one: a. large sample b. random sample normal population