A nurse on the labor and delivery unit wants to study the effects of having small children participate with the family in the delivery process on the bonding process between mother and child

A nurse on the labor and delivery unit wants to study the effects of having small children participate with the family in the delivery process on the bonding process between mother and child. For this study, the nurse has determined that a questionnaire will be mailed out to families who elect to have their toddlers in the delivery room during the delivery of a sibling. The questionnaire will include both open-ended questions and closed-ended (Likert-type) questions. Which aspects of the study should be considered to provide a rationale for selecting this mixed methods strategy?