Mark is a researcher interested in understanding whether anxiety is related to sleep. Mark designs a research study where he will ask participants to report their level of anxiety on the day of the study and then, on the following day, they will report the number of hours they slept the night before (i. e., the night of the study). Mark hypothesizes that higher anxiety during the day will be associated with fewer hours slept that night. It sounds like Mark's research design is .

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.

answer; face validity;