Question

amount vs time
which phrase
describes what is
happening in the
amount per trial vs.
time graph?
a constant
amount is eaten.
nothing is
consumed.
a negative
amount is eaten.
a changing
amount is eaten.
amount consumed each trial
time (sec)

Explanation:

Step1: Analyze the graph

The graph is a line with a negative slope (from (0,7) to (6,0)), meaning as time (x - axis) increases, the amount consumed per trial (y - axis) decreases.

Step2: Evaluate each option

• Option 1: "A constant amount is eaten" would be a horizontal line (slope 0), not a decreasing line. Eliminate.
• Option 2: "Nothing is consumed" would be a horizontal line at y = 0, not the case here. Eliminate.
• Option 3: "A negative amount is eaten" doesn't make sense (amount can't be negative in this context, and the graph shows decreasing positive amounts). Eliminate.
• Option 4: "A changing amount is eaten" – since the amount is decreasing over time (slope is negative, so the amount per trial is changing), this fits.

Step1: Analyze the graph's slope

The graph of "Amount vs Time" is a straight line with a negative slope (starts at (0,7) and ends at (6,0)). This means the amount consumed per trial is decreasing as time increases.

Step2: Evaluate each option

• "A constant amount is eaten": A constant amount would correspond to a horizontal line (slope = 0), but the graph has a negative slope. Eliminate.
• "Nothing is consumed": This would be a horizontal line at y = 0, which is not the case here. Eliminate.
• "A negative amount is eaten": Amount consumed can't be negative in this context, and the graph shows a decrease in positive amounts, not negative amounts. Eliminate.
• "A changing amount is eaten": Since the amount is decreasing over time (the slope is non - zero), the amount eaten is changing. This option is correct.

Answer:

D. A changing amount is eaten.

Wait, correction: The options are not labeled A - D in the standard way? Wait, looking back:

The options are:

Top left: A constant amount is eaten.

Top right: Nothing is consumed.

Bottom left: A negative amount is eaten.

Bottom right: A changing amount is eaten.

So the correct option is the bottom right one: "A changing amount is eaten."

So re - writing the answer: