A graph titled Average hamster weight kg vs Amount of drug mgday shows a downward-sloping line that reaches a minimum value and then stays there over the remainder of the graph?

OK, I'll take a crack at it:

Scenario #1):

- The drug is an appetite-suppressant.

- Various different-sized doses are given daily to a great number of laboratory hamsters.

- Each hamster is weighed once a week, and the average weight of all the hamsters

getting the same dose is plotted against the amount of the dose.

- The graph shows that the more appetite-suppressant medication the animals get,

the lower their weight averages, ... but only up to a point. More drug than that,

and they won't completely stop eating and die, but they'll stabilize at a relatively

constant weight regardless of the dose.

Scenario #2):

- This is a graph you get from the hamster vet, along with a drug that he wants you

to give your 75 pet hamsters.

- You'll be responsible for figuring out how much to give each one. Here's how you'll

do it:

..... You'll weigh each hamster every morning and every night for a week, and keep

the results in a big notebook.

..... At the end of a week, for each individual hamster, you'll calculate the average

of all 14 times that you weighed that one.

..... For each hamster, you'll look up his average weight on the graph, and the

line will show you how much of the drug to start giving that one daily.