[Solved] In an attempt to assess whether selection of a same-gender psychiatrist leads to better mental health outcomes, clients newly referred for mental health services are told they may choose their own psychiatrists. At the beginning of treatment, and again after 3 months of therapy, measures of mental health are performed. What type of quantitative research is this? A)Descriptive research B)Correlational research C)Quasi-experimental research D)Experimental research Hypothesized Mean Difference: The presumed difference between the means of two populations or conditions being compared in a statistical hypothesis test. Two-Tail: A term used in statistics referring to the two-tailed test of significance that checks for the possibility of positive or negative differences. Observations: The act of noting and recording something with instruments or the naked eye as part of a scientific or empirical study. Untreated Population: A group in a study or an experiment that does not receive the treatment or intervention being tested.