The student body president proposes that high school students be allowed to start school two hours later than elementary and middle school students. She believes that if high school students are more rested, they would have fewer absences from school. She is proposing a correlational study to examine this belief. - Describe the predicted relationship between the variables of this study.
- Identify the population the student body president is studying.
- Provide an example of a valid operational definition of “rested.”
- Provide a specific example of how the “third variable problem” could affect this study.
- Explain why an experimental version of this study might not be ethical.
- Explain how circadian rhythm could affect the results of this study.

The following table lists the birth rate, death rate, and net migration rate for egypt over the past 20 years. on a coordinate plane, plot the birth rate data and death rate data for egypt. clearly, show each data point and label each curve. be sure to label the graph and axes. save a copy of your graph. then answer the following questions: (14 points) a. what was the annual growth rate for egypt in 1990? what is the estimated annual growth rate in 2010? be sure to show your work for each answer. b. where does egypt most likely fall on the demographic transition model? explain your answer using data from the table. describe two changes within egyptian society that would likely be necessary for egypt to transition to the next stage in the model. c. assuming egypt’s current birth rate, death rate, and net migration rate trends continue, what will the country’s annual growth rate likely be in 2030? if this growth rate is accurate, what would its doubling time be in 2030?