Introduction



From left: Tian Lixia (Leader), Misliana, Md.Nursyahrin, Nur Sabreena and Rachel Lee.



We are a group of students from NR0906. Our group consists of five members, namely Rachel Lee, Misliana, Md.Nursyahrin, Nur Sabreena and Tian LiXia (Leader).

This blog is set up for our Statistics assignment to prove if a certain statement is true.

Our group has decided to find out if a person’s height is equivalent to their arm span. If this statement is true, we will then be able to measure the height of a person who is bed bound. This will be much more convenient rather than to put patient in a supine position when they can just stretch their arms when their height measurement is needed. This method can also be used for patient suffering from kyphosis as we can evaluate their height before and after the condition.  

Needless to say, we can also apply this method of measuring a person’s height to our clinical practice in the future.

We will prove this statement by collecting a sample of 30 respondent’s height – 15 males and 15 females.

Our Agenda: 

Determine if the use of arm span is an indicator of a person's height.

Testable Hypothesis:

• Research Hypothesis (H₁): 

There is a significance relationship between the measurement of the height and the length of a person arm span.

• Null Hypothesis (H₀):

There is no significance relationship between measurement of the height and the length of a person arm span.

Variables:

There should be two categories of variables in every experiment:

1. Dependent: 

A variable that is changed by the independant variable. ['effect']

Our variables (dependent): arm span

2. Independent: 

A variable that brings about a change in another variable ['cause']

Our variables (independent): height

Operationalization:

• This explains how the concept will be measured.

Tools used for our study:

Pilot Test:

Demonstration on how it will be carried out to our respondent

Time: 1400 hrs - 1600 hrs

Date: Monday, 1st  February 2011

Venue: NYP Library Carrel, Room 4-6

Before doing the actual data collection on our respondents, our team decided to have a pilot test to have a run through of the procedure among ourselves.

Some factors that were noted:

• Proper setting on space.
• Time taken for respondent to sign the consent form and complete the whole procedure.
• Ensure respondents' co-operation. Proper explanation will be given before the procedure to facilitate their understanding about the need for data collection.
• After doing the pilot test, we conclude that the approximate time to collect each respondent's data is 3 minutes

Points to take note while test is being carried out:

Respondents are to remove anything that may affect an accurate 
reading of their height. e.g hairbands and caps.

In order to obtain accurate result, a hard surface e.g. clipboard or 
book will be placed on top on the respondents’ head

Their arm span will be measured from the tip of the middle fingers 
and not from the tip of the nail as it will give an inaccurate reading

Data Collection:

We collected our data in the school library.

After getting the equipment ready, we search for respondents and invited them to participate in our research.

We explained to them that this data collection is strictly for research purpose of our assignment and they are being assured their identity will not be reveal by ensuring them that their face will be sensored. On top of that, this data collection will not take up too much of their time as the group members had already done a pilot test. By doing so, we are seeking for their co-operation for the procedure. Upon understanding, they will then be given a consent form, stating that they are giving us their informed consent. 

Consent Form


(click to enlarge)

These are the various pictures taken during the findings:

The tallest female in our finding. 

Tallest male in our findings.

The shortest female in our findings. 

Shortest male in our findings.

Moderate findings for male.

Moderate findings for female.

This are our findings/data of 15 male & female equally.

In the process of collecting data.

Analysis of Data:

Since both are scale data, Pearson’s R will be the best choice to determine the relationship.

(Click to enlarge)

Our result: 

Since the p=0.0005, which is less than 0.05, the null hypothesis should be rejected. There is a relationship between the measurement of the height and the arm span. Therefore, there is a positive, strong and significant association between the measurement of the height and a person arm span. (Pearson's R=0.938, p<0.05, N=30).  

However, what is the exact linear equation of the relationship between the measurement of the height and a person arm span?

(a)-Dependent Variable: Length of the arms of participants in (m)

As we all know that a general equation for a straight line is Y=mX+c. From the table we can get the c=-0.137, m=1.081, therefore, the linear equation of the relationship between the measurement of the height and the arm span is Y= 1.081X - 0.137 (Y means the length of both arms, X means the height)

In conclusion:
Implication of Findings
There is a positive, strong and significant association between the measurement of the height and a person arm span. The linear equation of this relationship is Y= 1.081X - 0.137 (Y= the arm span, X= the height).


This also links back to what we as a group wanted to prove where arm span is indeed  a predictor of height. Needless to say, in future we are able to measure the height of a person who is physically disabled with ease, not requiring them to stand up.

Our reflection:

Throughout the process of this project, we as a group learnt a lot on how important is statistic in life. It may seems unnecessary in our future career but statistic is indeed an interesting module. 


Initially the group of five faced some problems because we had a struggle in creating a blogspot as we know nuts about how to beautify it as well as expressing ourselves and are afraid that we are unable to deliver our research. However,with the commitment of the group members, we managed to overcome these hurdles by editing the blogspot umpteen times and we are really devoted in doing this project. With all the hard work, this beautiful blogspot is done by the five awesome.

During the period of collecting data
Our objective was to collect an equal number of males and females respondents. However, in our course, we are lack of males. Thus, we have to source for more males in the library. We noted that it is not easy to communicate with unknown respondents. However, they were friendly and co-operated with us well. 


For our findings, we do not faced much difficulties as it is straight forward and can be handled well. Furthermore, with the help of the module textbook, we are able to follow the steps taught in class and to come out with the outcome.


In a nutshell, we as a group enjoyed doing this project. Though it is challenging, it gave us a sense of understanding of the important learning point in this module. 


With this, we thank Ms Chia for your guidance and teaching! :)


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