Chegg true, false, or uncertain. in each of the following situations, state whether each statement is true, false, or uncertain, and explain your answer. your score is evaluated on the explanation you provide, therefore, if you do not provide explanation, you will not receive any credit even if you stated true, false, or uncertain correctly. a researcher wants to test h0: x = 30 versus the one sided alternative : x < 30. d. the 95% margin of error for the mean of a normal population with unknown is the same for all srs of size n.