Please answer the questions on the attached file in full sentences.

Guiding Questions for Early Assessment Exam PSY212 1. What are descriptive statistical tools and how and when are they used? Descriptive statistical tools are used for describing data and creating a single number to represent or describe a large set of numbers. They are used when there is a large population. 2. What is the relationship between treatment and within group variance? 3. W hat is the relationship between within group variance and extraneous factors? 4. What is random selection and how does it add validity to using sample statistics to estimate population parameters? 5. What are the standard units of deviation called within a norma l curve? 6. What is correlation? Correlation is a statistical tool that determines the strength of the relationship between two or more variables. 7. How are measurement scales related to statistical tools? Can statistical tools be used without regard to the me asurement scale on which a variable is measured? 8. What is the source or guidance for writing research reports in Psychology? 9. Is the selection of statistical tools independent of the research design that a researcher uses to gather his or her data?