Aresearcher is studying women recently admitted to a state prison. all potential subjects must have children under the age of five. research subjects will be given a basket of toys to use at their children's first visit that the children can then take home. in assessing this proposal, the irb needs to determine that the toys are:
a. age appropriateb. educationalc. not an excessive incentived. of high quality

option C.

Explanation:

The correct answer is option C.

The toys provided by the IRB (institutional reviewing board )  is not an excessive incentive

The excessive incentive is the amount of incentive paid by the company as compensation to the employee.                    

But here for research purpose, the toys are not used as the excessive incentive for the subject.      

The correct option is C Not expensive as Institutional review board (IRB) is accessing this proposal and based on economics toys should be Not an excessive incentive.

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.        

i honestly have no idea