Lesson 1 Focused on reading different graphs

Update:
I like the exercises, The course materials aren't that good too
For some reason I actually did stuck with a statistics course, wtf is this why am I getting interested to math all of a sudden :/

I'm transitioning to Introduction to Statistics | Coursera
Here are my notes for that Introduction to Statistics

Lesson 2 Focused on reading tables

Two Way Frequency Table
Two Way Relative Frequency Table (basically turning things into percentage)

WTF I don't get this part here

CONTEXT: A survey asked students at Wilson Academy which status they would prefer—to be happy, healthy, or rich—and how much pressure they felt from their homework. The two-way table of row relative frequencies below shows the data.

Preferred Status A LOT of pressure from homework
Happy 0.46
Healthy 0.46

^-- INCORRECT: An equal number of students who feel a lot of pressure from homework prefer to be happy as prefer to be healthy.
Reason: We only know the relative frequencies, not the actual counts of students.
If the numbers of students who prefer each status are different,
then the counts are different, even though the percentages are the same.

Preferred Status SOME of pressure from homework
Happy 0.39
Healthy 0.31
Rich 0.50

^-- INCORRECT: A person who feels some pressure from homework is most likely to prefer to be rich.
REASON:
We only know the row relative frequencies, not the column relative frequencies, so we cannot make this claim.
A small enough population of people who prefer to be rich could make it more likely that a student who feels some pressure from homework is most likely to prefer to be happy or be healthy.

Preferred Status VERRY LITTLE pressure from homework
Happy 0.13
Healty 0.15
Rich 0.05

^-- CORRECT: A student who prefers to be healthy is more likely to feel very little pressure from homework than a student who prefers to be rich.
15% of the students who prefer to be healthy feel very little pressure, while only
5% of students who prefer to be rich feel very little pressure.

OHHHH I FINALLY GET IT

Look at this G, so in here, the reason why we can say "We only know the row relative frequencies" is because look at the row total, it's on the row, not on column! So base on the table, we can conclude that every data is all about the preferred status.
“Khan Academy - Statistics_Table.png” could not be found.

So we can say that
8% of students who prefers being healthy feel no pressure of homework
15% of students who prefers being healthy feel very little of
Bruv, reading this data results doesn't make sense to me, like what
The higher the preference of being healthy, the more pressure they feel from homework??

Okay wtf I don't get it again

WTf, there is table relative frequencies and column relative frequencies
Wtf are these things

BRUV! For now, I'll rely on these good teacher I found years ago. He's genuinely good in teaching math/science and engineering in general
Understand Frequency Tables, Cumulative & Relative Frequency in Statistics - [7-7-3] (youtube.com)
then I'll go back to Khan Academy
Update: It's about writing frequencies, not interpreting it

next video: Two-Way Relative Frequency Tables - YouTube
sigh, this is annoying :/


Definitions - Glossary

Variables are basically the things we use to describe an Individual

  • Categorical variables take on values that are labels or categories,
  • Quantitative variables take on numerical values.

Created: 2024-02-20