# Week 4 Discussion: Probability

**Required Resources**

Read/review the following resources for this activity:

- OpenStax Textbook: Chapter 2, 3
- Lesson
- Minimum of 1 scholarly source

In your reference for this assignment, be sure to include both your text/class materials AND your outside reading(s).

**Initial Post Instructions**

Probability plays a major role in the medical community. Diagnoses are based on probabilities. They are really questions or “what if’s”, and are answered by the **probability** that the treatment will be the best for the ailment.

Let’s look at probability in terms of both the real world and the medical community.

- Survey 30 people to find out if they are left-handed or right-handed, and use the following chart to create a contingency table with the information.

Left handed Right handed Total Female Male Total

- Answer the following questions about the information in your contingency table:
- If a person is randomly selected from the survey participants, what is the probability that the person will be left-handed?
- If you randomly choose a female from the people you surveyed, what is the probability that she is left-handed?
- What is the odds ratio of choosing a left-handed
**female**? - What is the relative risk of choosing a left-handed
**female**?

**SOLUTION**

Professor and Class,

According to Holmes et al (2018), probability refers to a measure that shows how certain a given outcome is. From my sample of 30 people at the park around my neighborhood is as follows:

- If a person is randomly selected from the survey participants, what is the probability that the person will be left-handed?
**The probability that the person will be left-handed is 3/30= 0.10** - If you randomly choose a female from the people you surveyed, what is the probability that she is left-handed? T
**he probability that she is left-handed is: 2/18=0.11** - What is the odds ratio of choosing a left-handed
**female**? T**he odds ratio is calculated as (A/B)/(C/D)=AD/BC 22/16=1.4** - What is the relative risk of choosing a left-handed
**female**?**(2/3)/(16/27)= 1.13**

** **According to Orr (2001), more people around the world tend to right-handed, as compared to the left-handed people, as 10-13% of the people are left-handed……..

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