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Variables are things in an experiment
that can be changed. In good laboratory experiments, scientists
like to have only one variable change at a time. Then, if they get
a different result, they can be sure why it happened. In nature
this is hard to do, but scientists have to be careful to note all
of the variables so that interpretation by other scientists can
be well-informed.
Assignment
(Note: you can replace this experiment with one of your own choosing
if you wish. E-mail me to get permission before you start)
Step 1:
Imagine that you love really crispy chocolate chip cookies. As a
future chef, you want to learn the secret to making really crisp
cookies every time (note, gooey, soft cookies can be substituted
if that is your preference). You want to experiment with cookie-making
to determine what factor will allow you to make the perfect crispy
cookie. First, you need to think of some of the things that might
be varied when baking cookies. List those things and submit them
here:
Step 2:
Next, run a controlled experiment. Of the variables listed (mine
or yours), which do you think is most likely responsible for making
the cookies crispy (or gooey)? Once you have decided which one is
responsible, make a plan (procedure) to make cookies, changing only
one of the variables. Be sure that the variable you are changing
is clear in your procedure. Submit your procedure:
Step 3:
Finally comes the fun part. Bake the cookies
following your procedure. Collect data (you might invite several
friends or family members to help you determine which is the crispiest)
and draw a conclusion. Post a summary of your procedure and results
to the cookie cooking discussion group:
Go to
Lesson 5: Describing >>
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