3. In a study of the effect of the applicant's eye contact (yes, no) and the personal officer's gender (male, female) on the personal officer's assessment of likely job success of an applicant, personnel officers were shown a front view of an applicant's face and were asked to give the person in the photograph a success rating score. Half of the officers in each gender group were chosen at random to receive a version of the photograph in which the applicant made eye contact with the counselors. The other half received a version in which there was no eye contact. Data were collected on success ratings. (a) What type of study is this, experimental, observational, or mixed? Why? (b) Identify all factors, factor levels and factor level combinations. (c) What type of study design is being implemented here? (d) What is the basic unit of study