Question

which term describes what is happening in the amount per trial vs. time graph?
a negative amount is eaten.
nothing is consumed.
a changing amount is eaten.
a constant amount is eaten.

Explanation:

Step1: Analyze the graph trend

The graph shows a straight line with a negative slope, meaning the amount consumed per trial decreases as time (in seconds) increases. So the amount is changing (decreasing) over time.

Step2: Evaluate each option

• Option A: The amount is positive (between 2 - 7 initially), just decreasing, so "negative amount eaten" is wrong.
• Option B: The graph shows a decrease, so something is consumed, this is wrong.
• Option C: Since the amount per trial decreases over time, the amount is changing, this is correct.
• Option D: A constant amount would be a horizontal line, but the graph has a slope, so this is wrong.

Answer:

C. A changing amount is eaten.