Answer:
$10 what you would have earned at the job
Explanation:
Opportunity cost is the cost of the next best option forgone when one alternative is chosen over other alternatives.
When you decide to volunteer, you would not be able to go to work. The opportunity cost of volunteering is what you would have earned if you were at work
Answer: Sample selection bias
Explanation: Sample selection is a term used to describe the various steps and processes through which a researcher was able to determine and collect his or her samples.
Bias is an inclination towards or a prejudice against one or more parties or factors in an experiment or a Research.
SAMPLE SELECTION BIAS IS ONE OF THE MAIN CAUSES OF POOR OR WRONG OUTCOMES DURING A RESEARCH OR AN EXPERIMENT.
depends on what the following is.