2. Listen carefully to the instructions
5 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 : Lesson 10 and 11 : relative and
conditional relative frequencies
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 2 and entry tickets will be graded by
tomorrow (apologies for the delay)
Quiz 3 from lesson 7 to 10 on Monday 1st of
October
My next office hours (in ASI) are Tuesday
after school.
5. Today’s word is very connected
We need to deal with big data and statistical
methods are key
https://www.youtube.com/watch?v=LtScY2gu
Zpo
6. Frequency Tables deal with categorical data
Bivariate means two variables,we could have
more
Frequency refers to the number of occurences
of a variable
Joint Frequency : Joining two variables,
Marginal Frequency : involving total
7. Exploratory challenge 2 in lesson 11 page 68
(pdf)
Exercices 6 to 10 in lesson 11 page 69
8. Was posted in classroom
Remind of Homework Expectations
Go over correction
9. • Sometimes the frequency table is not detailed enough => We’ll explore
relative frequency tables
• Relative frequencies : relate the each frequency count to the total
number of observations
• Relative frequency =
𝒇𝒓𝒆𝒒𝒖𝒆𝒏𝒄𝒚
𝒕𝒐𝒕𝒂𝒍
• Could be expressed as a decimal,percent or a fraction
10.
11.
12.
13. Instructions :
• Listen carefully to the instructions
• Take 5 minutes to do the exercises on your
own
• Individual/no discussions
• Raise your hand quietly for questions and wait
for me to come
14.
15.
16.
17.
18.
19.
20. Why would several students argue against
Scott’s initial suggestion of choosing super
strength?
0.2% of the responses were females who
preferred this power
Why might Scott have made this suggestion?
Maybe personal preference
Why would Jill say to use telepathy?
It has the largest frequency count for
females.
21. Do you think there is a difference in the
superpowers selected by males and those
selected by females?
Yes. 1% of the sample were females who
prefer flying and 5% of the males preferred
flying
Can we judge based on this relative frequency
table what to choose ?
No,in next lesson we’ll learn a fair tool :
conditional relative frequencies
22. Your engagement will be assessed based on a
participation rubric
Voice level 1
A hardcopy per group will be handed
Focused and on task
I will be going around groups to help,wait for
your turn
8 minutes only
Everyone in a group should be writing on
their notebook and collaborating
23.
24. We discovered in the last activity that there is
an association between power chosen and
gender
How can we perform a more careful analysis ?
By taking into account each gender group
separately
That’s the idea of a conditional relative
frequency
Relative frequencies for males and relative
frequencies for females
25.
26. How is relative frequency calculated?
It is calculated by dividing the frequency by
the total observations
How could we determine a relative frequency
for only the female students?
We could determine this by dividing the
frequency by the total number of females
Conditional relative frequencies are found by
dividing the frequency by the marginal total.
27. What is the conditional relative frequency of females
who chose to fly as a superpower ?
How would we interpret the conditional relative
frequency?
21.5% of the females surveyed chose to fly as their
favorite superpower.
How does this value compare to the relative
frequencies computed in the previous lesson ?
The relative frequency of females who chose flying as
a super power is 10.9%. We were underestimating
28. Your engagement will be assessed based on a
participation rubric
Voice level 1
A hardcopy per group will be handed
Focused and on task
I will be going around groups to help,wait for
your turn
15 minutes only
Everyone in a group should be writing on
their notebook and collaborating
32. 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
33. 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
34. 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.
