Describe a research study that contains an example of a confounding variable.Book Resources:Gravetter, F., & Forzano, L. (2016).

1:Explain why you are more likely to obtain a representative sample with proportionate stratified random sampling than with either stratified random sampling or simple random sampling.Question #2:What is a confounding variable? How does it affect the validity of your research study? Describe a research study that contains an example of a confounding variable.Book Resources:Gravetter, F., & Forzano, L. (2016). Research methods for the behavioral sciences (5e. ed.). Stamford, CT: Cengage Learning.