# MATH 225N Week 4 Discussion: Probability

## MATH 225N Week 4 Discussion: Probability

MATH 225N Week 4 Discussion: Probability

For grading purposes, this particular
discussion posting area runs from Sunday
Jan 24 through Sunday Jan 31, inclusively.

We explore ( mathematical ) Probability this
Week. This includes probability concepts,
conditional probability, independence,
dependence, event( s ), the concept of
“mutually exclusive,” the concept of
“complement,” the multiplication rule, and
the addition rule.

Please don’t forget to use an “outside”
resource as part of the content and
documentation for your first Post – the Post
which is due on or before Wednesday of the
Week – the Post where you make the most
major contribution to the Weekly
discussion posting area and attempt to
address the discussion prompts / cues for
the Week. It could possibly include a web
site that you discovered on the internet at
large, so long as the web site is relevant and
substantial and does not violate the
Chamberlain University policy for
prohibited web sites, and so forth. It could
possibly include references / resources that
you discover through making use of the
online Chamberlain University Library (
please click Resources along the left and
then click Library to discover the link to the
Chamberlain University online Library ) . 🙂

Check out the link below for some
information about concepts such as
independence, dependence, mutually
exclusive, disjoint, complement, and
conditional probability.

Please remember that probabilities
are NOT percentages and so the
answers ( no doubt approximate and
rounded off ) in the examples about
the green cat above should please be
respectively

0.54      0.67      for the two probability
questions and

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the answer for the odds ratio
question should be
approximately  2.67  and

the answer for the relative risk
question should be
approximately  1.71

You will want to please be very
careful how you set up the rows and
columns of your two way table (
which is also called a contingency
table ) if you are hoping to make a
perfect analogy between how the
questions were worked out for the
green cat and how the questions
would be worked out for your left
handed females.

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Would the analogy work best if you
set up your own two way table like
this ??

Left Handed Right Handed Total

Females
Males
Total

I am really asking ( this is not
rhetorical ) because I am just
glancing at this assignment for the
first time this morning.      😉

Also your lower right cell here
should be 30 .

And the sum of the four cells
involving left handed females, right
handed females, left handed males,
and right handed males should be 30
as well.

That is, you survey 30 humans and
each human is placed into one and
only one of those 4 possible cells.

Then you compute and fill in column
totals and row totals.

Then as you will see the Table Total
or the Grand Total in the lower right
will be 30 .

Once you set up your contingency
table ( two way table ) correctly,
answering the 4 questions will be a
breeze.  But give probabilities with
answers like  0.XXXX  please !!

DON’T state a percentage as an
answer to a probability question.

Try hard to use one of the two
provided links to find your “outside”
reference / resource this Week 4 .

It would get boring though in a large
class if EVERYONE did that.  So
please do that if you can but if a few
Folks choose to find some other
“outside” reference / resource this
Week ( about left handedness and
right handedness issues and trends
and data ) that would certainly add
some variety and freshness to our
Week 4 graded Posting area.

Finally, many of you might make
mistakes this Week, even though you
have the example provided about the
Green Cat( s )

So if you correct each other’s
mistakes in follow up Posts, please
be polite and sensitive and
diplomatic and professional and all

that – and I will try hard to do that as
well.  We are all Friends and fellow
learners here.

Thanks Friends and here below are a
couple Videos to watch if you are
concerned that the one Green Cat( s
) example is not quite enough to
make you feel confident and secure
about all of this.

Thanks Friends and work hard this
Week 4 !  Your commitment and
energy and drive and motivation will
be put to the test during this Week 4

Link (Links to an external site.)Links to an
external site.

This is one kind of an example of using an
“outside” source / resource to add to what is
revealed in our Weekly Lesson in Modules
and in our Weekly text book reading.

Please don’t forget to look over the Graded
Discussion Posting Rubric each Week to be
certain that you are meeting all of the
Frequency requirements as well as all of the
Quality requirements for graded discussion
posting each Week.

If you have any questions about anything,
please do not hesitate to post in the Q & A
Forum discussion posting area or to send
me a direct e-mail message
to  CSmith10@chamberlain.edu

Thanks Friends and Good Luck !  Work hard
and learn a lot !!

Sincerely,  Mr. Smith     Chamberlain
University     Math, Statistics, and
Quantitative Research