a) The Guardian summarized the IQ study even though it had not yet been peer-reviewed. Is that a wise choice for a journalist? b) Oster focused on the effect size of this study, but there are two other statistical validity questions we usually also ask. What question could you ask to get at the precision of this IQ estimate? c) What question could you ask to get at replication of this estimate? And, why is replication important for any study? d) Oster suggests that masked adult testers might be responsible for this unusual result. With this suggestion, which of the four big validities is she critiquing? e) You could design a study to test whether having a masked adult tester does cause lower IQ estimates in infants they are evaluating. Propose the independent and dependent variable in such a study, and indicate what the results would be if masks do lead to a distortion of IQ scores