Catalyst – August 5(4), 2009 your seat! observations

Catalyst – August 5(4), 2009
Remember, your groups are in rows – remember
your seat!
 Write down 5 observations about Ms. Stroh.
Next, make an inference BASED ON THOSE 5
OBSERVATIONS.
You have 5 minutes!
Today’s Agenda
Catalyst
 Hypothesis Notes
 Intro to The Stroop Effect Test
 Perform The Stroop Effect Test
 Independent Work Time: Finish lab
report for homework
 Exit Question
Syllabus Quiz Tomorrow!

Exit Questions from Yesterday
1.
2.
In your own words, describe the difference
between an observation and an inference.
Label the following statements as either
observation (O) or inference (I). Don’t write the
statements!





Glue feels sticky. (O)
Michael Jordan was the best basketball player of all
time. (I)
Talib Kweli writes beautiful lyrics. (I)
Pickles smell gross! (I)
Christian hears the bell ringing. (O)
Today’s Objectives
SWBAT make a quality hypothesis.
 SWBAT test a hypothesis in an
experiment.

Think – Pair – Share
Where have you heard the word
hypothesis before?
 What does the word hypothesis mean?
Go further than just “educated guess.”

What’s a hypothesis good for?

Key Point #1: Scientists make
hypotheses to answer questions they
have about the world.
Remember inferences?
A hypothesis is a type of inference
Hypothesis
Key Point #2: A hypothesis is an
educated, testable guess.
 Educated = there’s a reason you guess
what you guess
 Testable = there’s a way to prove it right
or wrong
Example 1


Question: Will Ms. Stroh run faster than her
soccer players if she wears her cleats rather than
her tennis shoes?
Hypothesis: If Ms. Stroh wears her cleats, then she
will run faster than her soccer players.
 Is
it educated?
 Yes!
 Is it testable?
 Yes!
Example 2



Is this a good hypothesis?
Question: Would Lil’ Wayne be as popular as he
is now in the 1970s?
Hypothesis: If Lil’ Wayne was in the 1970s, then
he would be just as popular.
 Is
it educated?
 Yes!
 Is it testable?
 No!
Example 3 (T-P-S)



Is this a good hypothesis?
Question: Do students at West Jeff like green or
orange more?
Hypothesis: Students at West Jeff like green
more.
 Is
it educated?
 No!
 Is it testable?
 Yes!
Example 4 (T-P-S)



Is this a good hypothesis?
Question: Do people prefer Pepsi or Coke?
Hypothesis: Everyone prefers Pepsi over
Coke….duh!
 Is
it educated?
 ???
 Is it testable?
 No!
What
would
happen
if
you
ate
Why is this man happy?
this ice cream?
What is this
woman
thinking?!?!
Example 5 (T-P-S)



Question: Will using pheromone cologne allow
one man to attract more women?
Come up with a hypothesis with your group.
Remember….
 It
must be educated
 It must be testable
Example 6 (On your own!)


Question: Does listening to classical music improve
student’s performance on tests?
Come up with a hypothesis on your own.
Stroop-a-doop

When you first learned to tie shoelaces, you needed to
carefully think through each step of the process.



Many behaviors can become automatized: typing, reading,
writing, bicycling, piano playing, driving, etc.
To explore properties of automatized behaviors, cognitive
psychologists often put observers in a situation where an
automatized response is in conflict with the desired behavior


Now, you probably do not even seem to think about the steps but
simply initiate a series of movements that seem to proceed
without any further influence. This is called automatization. (Think:
automatic)
The Stroop effect
Stroop (1935) noted that test subjects were slower to
identify red ink when it spelled the word blue
Stroop-a-doop: Roles

In this lab, there are 4 positions:
 Time
Keeper
 Test Subject
 Test Proctor
 Signal Giver
Each
person will get an opportunity
to be each role!
Stroop-a-doop: Let’s model this

I need 4 volunteers!
Matching Color
RED
BLUE
YELLOW
YELLOW
GREEN
RED
Non-Matching Color
RED
BLUE
YELLOW
YELLOW
GREEN
RED
Stroop-a-doop: Class Discussion

What was measured in this experiment?
 Dependent

variable: time
What was intentionally changed in this experiment?
 Independent
variable: ink color, matching or non-
matching


What things were held constant in this experiment?
Was your hypothesis right or wrong?
Exit Questions
1.
2.
What are the characteristics of a good
hypothesis?
Write a quality hypothesis using the following
question:
 Will Ms. Stroh’s students achieve higher
mastery of GLEs than Mr. LY’s students if
they pay attention in class everyday?
Group Chat


What was the dependent variable in this lab?
HINT: What did I measure?
Group Chat

What was the independent variable?

HINT: What did I change?
Group Chat


Discuss what is wrong with this conclusion:
Jeremiah took 8.5 seconds to go through the nonmatching list. Therefore, it takes longer to go
through the non-matching list than the matching list.
Group Chat

Was there a control in this experiment? Why was it
necessary?
Independent time

Each person must turn in a lab report on the Stroop
experiment.
Exit Questions


Why are controls necessary in valid scientific
experiments?
If I am testing whether I score more points if I am
wearing my Air Jordans in an experiment, what
would be a good control group?