**Class 2: Can you taste the difference?**

**Part 1: Coke vs. Pepsi: Designing an experiment**

Identify a member of your
group who claims to be able to tell the difference between Pepsi and Coke. Design an experiment to test whether
this is true. Decide exactly what
data you will collect and what results will convince you that the taster is not
just bluffing.

Write your experimental
design on the board.

While you are waiting for
other groups to finish their designs, work on Part 2 below.

**Part 2: Questionnaire**

In your group, talk about
what information you would like to find out about students in the class. Your
objective is to generate 5 good questions that contain at least one question
asking for a yes/no answer, one asking for qualitative information (word or
phrase) and one asking for numerical information. Each group should write the 5
questions on a piece of paper and hand it in to me before you leave today.

I will select some of these
questions and add a few of my own to end up with a questionnaire of about 25
questions. On Thursday I will ask you to answer this questionnaire. Next Tuesday weÕll explore the data with
Microsoft Excel.

**Part 3: Do the experiment**

After all groups have
finished designing the Coke-Pepsi experiment and we have discussed design,
carry out the experiment and write your results on the board.

**Journal Assignment: **

1)
Describe the
design of the experiment that your group came up with for the Coke Pepsi taste
test.

2)
Describe the
results of the experiment.

3)
My daughter
canÕt tell the difference between Coke and Pepsi. Suppose I brought her in to class and you repeated your
experiment on her. How likely to
you think it would be for her to do as well or better than your groupÕs taster
did, just by chance? Figure out
the probability if you can, or explain how you could go about figuring it out.

4)
Optional /
bonus: Compare your experiment to another groupÕs experiment.

**Homework Assignment 2 for
Thursday, Sept. 3: **

Do review exercises 7,11, 12
in Ch 2. Read Ch 3 and do review
exercises 1, 3ac in Ch 3 (draw the histograms for #3)