Final answer:
In a one-group, posttest only research design, the study is designed to answer questions related to the effectiveness of a specific treatment or intervention.
Step-by-step explanation:
In a one-group, posttest only research design, the study is designed to answer questions related to the effectiveness of a specific treatment or intervention. The design involves administering a posttest to a single group after the treatment is implemented.
For example, in a study investigating the effectiveness of a new math textbook, the researcher would administer the posttest to a group of high school students who have received instruction using the textbook for a year. The results of the posttest would provide information on how well the textbook has improved the students' math skills.
This type of research design is commonly used in various fields, including Science, to evaluate the impact of interventions or treatments.