2. Spread the seats
Listen carefully to the instructions
22 min
Individual/no discussions
Raise your hand quietly for questions and wait
for me to come
Stay seated until I ask you to give me back the
papers
3. WALT : Associations between numerical variables
Scatterplots
WILF : Seatings in semi-circles and focused class
work
TIB : There are many versions of frequency tables
and each version helps us peek at the data from
a different perspective. This opens insights.
4. Quiz 4 Tuesday 9th October (Lesson 11 to Lesson 15
in statistics package)
All my powerpoints are accessible either through
classroom or engrade
I post all corrections on engrade
My next office hours (in ASI) are Thursday 4th of
October after school.
Target behavior of Month : Staying focused and on
task during classtime
5. Conditional relative frequencies : divide
frequency by marginal frequency
Association between variables means there is
a correlation,as one increases the other
increases/decreases
Conditional frequencies cqn be used to
assess whether there is an association
between variables
6. I could see if you didn’t do it, after 3 strikes I
inform your parents.
Khanacademy skills related to relative
frequencies
No homework for next session
Correction
7. Instructions :
• Listen carefully to the instructions
• Take 25 minutes to do the exercises on your own
• Stay focused
• Voice level 1 discussions (no excessive noise)
• Raise your hand quietly for questions and wait for
me to come
8.
9.
10.
11.
12. We analyzed categorical data using frequency
tables
Concerning numerical variables, we use
scatterplots
Scatterplot : If two numerical variables are
denoted by x and y, then the scatterplot of
the data is the plot of the data pairs
13. Is there any pattern in this scatterplot ?
Yes,we always look for patterns and try to
explain them
14.
15. Hardcopy is handed out
Individual work,voice level 0
I will be going around for help,raise your
hand
Take 7 minutes to do this
16.
17.
18. Is there a relationship between the number of
cell phone calls and age, or does it look like
the data points are scattered?
There is a relationship.
If there is a relationship between the number
of cell phone calls and age, does the
relationship appear to be linear?
The pattern is linear—as age increases, the
number of cell phone calls decrease.
19.
20. Is there a relationship between moisture
content and frying time, or do the data points
look scattered?
There is a relationship
If there is a relationship between moisture
content and frying time, does the relationship
look linear?
As the frying time increases, the moisture
content decreases. It is not linear.
This is called an exponential curve
21. Scatter Plot 3 shows data for the prices of bike
helmets and the quality ratings of the helmets
(based on a scale that estimates helmet quality).
22. Is there a relationship between quality rating
and price, or are the data points scattered?
There is no relationship; the points are
scattered.
If there is a relationship between quality
rating and price for bike helmets, does the
relationship appear to be linear?
Because there does not appear to be a
relationship between quality rating and price,
it does not make sense to say the relationship
is either linear or not linear.
23. What does this tell us about rating and price?
There is no relationship between rating and
price that we can summarize
Is an expensive helmet going to provide the
best protection?
Based on data, an expensive helmet may not
necessarily provide the best protection
26. Do not talk unless you have
permission (Raise your hand)
No talking back (Come see in end
of class)
Stay focused and on task
Respect your classmates and
teacher
Be prepared
27. You are expected to do your homework on the
due date (no excuses)
Every time you miss a homework you get a
strike,after 3 your parents are informed
Not doing your homework will negatively affect
your grade in participation and quizzes
28. The corrected quiz as well as rubrics will be posted on
Engrade.
An individual assesment means no discussion at all. Any
talking will result in a 0.
If you missed a quiz/test, you are responsible to come to
office hours to retake it.
Come see me right after class or office hours to discuss
your copy, do not bring it up inside class.
Any copy written in pencil cannot be considered for re-
grading, use a pen.
