Trista is trying to decide how to spend her money. she adds and subtracts by a dollar to determine which combination of expenses will offer her the greatest benefit. tristaís decision making process is an example of which of the following?

i. thinking on the margin
ii. analyzing costs and consequences
iii. economizing her decision
a.
i only
b.
i and iii only
c.
ii and iii only
d.
i, ii, and iii

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: