HURRY PLEASE! in the United States, who pays income taxes? How are payroll taxes part of the income tax that workers pay to the federal government? (Site 1)

American individuals pay income taxes but wealthier people pay a larger amount then regulars on income taxes. The federal government takes on the standard of payroll taxes as apart of the income tax that a worker is paid by using the revenue to fund social security, medicare, and other social insurance groups.

Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.