7/ The results of anexperiment on the effects of sleep training on sleep quality showedthat participants who received eight sessions of sleep enhancementtraining had longer sleep duration and better sleep quality thanparticipants who did not receive the training. This led theresearchers to conclude that an eight-week sleep enhancementtraining program is effective for improving sleep quality. What advantage ofexperimental research does this demonstrate? Multiple Choice Question Experimental research helps establish cause and effectrelationships. Experimental research reviews media (e.g., old texts, pictures)to explore patterns in behavior. Experimental research allows the researcher to serve as aparticipant in the study. Experimental research uncovers as much as possible about asingle person or situation. 8/ A research teamdesigned a study of parenting style that included three groups:parents in their 30s with preschool-age children (2-5), parents intheir 40s with children ages 6-11, and parents in their 50s withadolescents ages 12-18. This design is considered by theresearchers to be less-time consuming and expensive than otherpotential designs, but they acknowledge the limitation of havingonly one measurement of parenting style for one point in time. Assuch, they cannot conclude that changes between parent groupsindicate changes with age over time. Which research designdoes this describe? Multiple Choice Question Cross-sectional research design Cohort sequential research design Sequential research design Longitudinal research design 9/ College students are often recruited for research studies ofyoung adult development, but this is often discussed as alimitation of those studies. How do you explain this? Multiple Choice Question It is an ethical violation to recruit college and universityparticipants without their parents’ consent. College students are not randomly selected from the largerpopulation, and they may not represent all young adults in oursociety. It is more difficult to get IRB approval for studies involvingcollege and university students. University students tend to have higher rates of attritioncompared to non-university students. 10/ A researcher who studies language development and tracks therate at which toddlers learn new words is interested in whichdomain of human development? Multiple Choice Question Psychosocial Lifespan Cognitive Physical