# MATH 225N Week 4 Discussion: Probability

## Sample Answer for MATH 225N Week 4 Discussion: Probability Included

**A Sample Answer For the Assignment: **MATH 225N Week 4 Discussion: Probability

**Title:** MATH 225N Week 4 Discussion: Probability

Professor and Class,

In order to gather the following data, I asked fellow family members and friends what their dominant hand was. It resulted in the following table:

Female | Male | Total | |

Left-Handed | 4 | 5 | 9 |

Right-Handed | 15 | 6 | 21 |

Total | 19 | 11 | 30 |

- If a person is randomly selected from the survey participants, what is the probability that the person will be left-handed?
- 9/30 participants were left-handed.

- Probability: 9/30= 0.30

- If you randomly choose a female from the people you surveyed, what is the probability that she is left-handed?
- 19/30 participants were female. Of those who were female 4/19 were left-handed.

- Probability: 4/19= 0.21

- What is the odds ratio of choosing a left-handed female?

- (4/5)/(15/6)= 0.32

- What is the relative risk of choosing a left-handed female?
- [4/(4+15)]/[5/(5+6)] = (4/19)/(5/11)

- Relative Risk= 0.46

I skimmed through the first article linked in our discussion “Being a Lefty is All Right” according to Orr, 2001 10 to 13% of the world’s population is left-handed. I thought this was a fairly small percentage, but it is even smaller than in the sample I collected. This is not unexpectedly however, as the law of large numbers states “as our sample size increases the probability found in the sample size will be closer to the expected outcome” (Week 4 Lesson: Probability in Everyday Life, 2021). According to Mwaniki, 2018 10-12% of the world’s population is left-handed and of those who are left-handed, men are 23% more likely to be than women. The fact of men being more likely than women to be left-handed also held true in my sample study.

Brennaa Sullivan

### Struggling to Meet Your Deadline?

Get your assignment on** MATH 225N Week 4 Discussion: Probability** done on time by medical experts. Don’t wait – **ORDER NOW**!

## References:

Mwaniki, A., (2018). What Percentage of The World Population Are Left Handed? *World Atlas. *https://www.worldatlas.com/articles/what-percentage-of-the-world-population-are-left-handed.htmlLinks to an external site.

Orr, T., (2001). Being a lefty is all right! *Current Health. 28*(2):12-13. Week 4 Lesson: Probability in Everyday Life. (2021). Chamberlain University. https://chamberlain.instructure.com/courses/75447/pages/week-4-lesson-probability-in-everyday-life?module_item_id=10306877

## 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

**Click here to ORDER an A++ paper from our Verified MASTERS and DOCTORATE WRITERS MATH 225N Week 4 Discussion: Probability :**

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.

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 [email protected]

Thanks Friends and Good Luck ! Work hard

and learn a lot !!

Sincerely, Mr. Smith Chamberlain

University Math, Statistics, and

Quantitative Research

### 5. Grading Rubric

Discussion Criteria | A (100%) Outstanding or highest level of performance | B (87%) Very good or high level of performance | C (76%) Competent or satisfactory level of performance | F (0) Poor or failing or unsatisfactory level of performance |
---|---|---|---|---|

Answers the initial graded threaded discussion question(s)/topic(s), demonstrating knowledge and understanding of concepts for the week.16 points | Addresses all aspects of the initial discussion question(s) applying experiences, knowledge, and understanding regarding all weekly concepts.16 points | Addresses most aspects of the initial discussion question(s) applying experiences, knowledge, and understanding of most of the weekly concepts.14 points | Addresses some aspects of the initial discussion question(s) applying experiences, knowledge, and understanding of some of the weekly concepts.12 points | Minimally addresses the initial discussion question(s) or does not address the initial question(s).0 points |

Integrates evidence to support discussion. Sources are credited.* ( APA format not required) 12 points | Integrates evidence to support your discussion from:assigned readings** OR online lessons, ANDat least one outside scholarly source.***Sources are credited.*12 points | Integrates evidence to support discussion from:assigned readings OR online lesson.Sources are credited.*10 points | Integrates evidence to support discussion only from an outside source with no mention of assigned reading or lesson.Sources are credited.*9 points | Does not integrate any evidence.0 points |

Engages in meaningful dialogue with classmates or instructor before the end of the week.14 points | Responds to a classmate and/or instructor’s post furthering the dialogue by providing more information and clarification, thereby adding much depth to the discussion.14 points | Responds to a classmate and/or instructor furthering the dialogue by adding some depth to the discussion.12 points | Responds to a classmate and/or instructor but does not further the discussion.10 points | No response post to another student or instructor.0 points |

Communicates in a professional manner.8 points | Presents information using clear and concise language in an organized manner (minimal errors in English grammar, spelling, syntax, and punctuation).8 points | Presents information in an organized manner (few errors in English grammar, spelling, syntax, and punctuation).7 points | Presents information using understandable language but is somewhat disorganized (some errors in English grammar, spelling, syntax, and punctuation).6 points | Presents information that is not clear, logical, professional or organized to the point that the reader has difficulty understanding the message (numerous errors in English grammar, spelling, syntax, and/or punctuation).0 points |

PARTICIPATION:Response to initial question: Responds to initial discussion question(s) byWednesday, 11:59 p.m. M.T. | 0 points lostStudent posts an answer to the initial discussion question(s) by Wednesday, 11:59 p . m. MT. | -5 pointsStudent does not post an answer to the initial discussion question(s) by Wednesday, 11:59 p . m. MT. | ||

PARTICIPATIONTotal posts: Participates in the discussion thread at least three times on at least two different days. | 0 points lostPosts in the discussion at least three times AND on two different days. | -5 pointsPosts fewer than three times OR does not participate on at least two different days. |

## Don’t wait until the last minute

Fill in your requirements and let our experts deliver your work asap.