You allow fifteen students, chosen at random, an extra day to study for the microeconomics exam, and then measure the score differences between those who got the extra day to study and those that did not. Which of the following could be impediments to implementing this experiment in practice? A. It could be considered unethical to allow some students more time to study.
B. It could be costly to administer the same exam to two different groups of students in the same class on different days.
C. It could be against school policy to administer the same exam to two different groups of students in the same class on different days.
D. A and C only.
E. All of the above could be impediments to implementing this experiment in practice.

In 2018, laureen is currently single. she paid $2,800 of qualified tuition and related expenses for each of her twin daughters sheri and meri to attend state university as freshmen ($2,800 each for a total of $5,600). sheri and meri qualify as laureen’s dependents. laureen also paid $1,900 for her son ryan’s (also laureen’s dependent) tuition and related expenses to attend his junior year at state university. finally, laureen paid $1,200 for herself to attend seminars at a community college to her improve her job skills.what is the maximum amount of education credits laureen can claim for these expenditures in each of the following alternative scenarios? a. laureen's agi is $45,000.b. laureen’s agi is $95,000.c. laureen’s agi is $45,000 and laureen paid $12,000 (not $1,900) for ryan to attend graduate school (i.e, his fifth year, not his junior year).