What is the difference between an income tax and a payroll tax?
A. Income taxes are collected based on income while payroll taxes
are collected based on wealth.
B. Income taxes increase the purchasing power of the government
while payroll taxes increase the purchasing power of workers.
C. Income taxes are used for a wide variety of government activities
while payroll taxes pay for specific programs.
D. Income taxes reduce the demand for harmful goods while payroll
taxes don't affect this demand.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: