Analysis and reporting of biostatistical data

HSC2141: Analysing Patterns of Health and Disease

Assessment Task 2: Written assignment – Analysis and

reporting of biostatistical data

Janderson de Araujo Knust - 26215675

Monash University

Section A

1 -

School Type	Frequency	Percentages
1	80	51,61%
2	49	31,61%
3	9	5,81%
4	17	10,97%
Total	155	100,00%

2-

[pic 1]

Figure 1: School Type (frequency) 1 = Co‐educational – government 2 = Single sex – private 3 = Single sex – government 4 = Co‐educational – private (n=155).

3- According to the data 80 of the 155 surveyed attend government co-educational schools and being 51.61% of the total. Of all 155 students, 49 attend to private schools of single sex, being 31.61% of the total. In relation to students that attend to single sex government schools, they are 9 of 155 students and the total of 5.81%. Finally, students of co-educational private schools are a total of 17 of 155 and them 10.97% of the total.

4-

Number of “close friends”	Frequency	Percentages	Cumulative percentages
0	7	4,52%	4,52%
1	19	12,26%	16,78%
2	30	19,35%	36,13%
3	23	14,84%	50,97%
4	34	21,94%	72,91%
5	23	14,84%	87,75%
6	12	7,74%	95,49%
7	4	2,58%	98,07%
8	2	1,29%	99,36%
12	1	0,65%	100%
Total	155	100,00%

5-

[pic 2]

Figure 2: Number of “close friends” self-reported by students (n=155).

6-

According to the data, most students believe that they 4 friends and they are 34 of 155 students being a total of 21.94%. Furthermore, 7 students consider themselves not having friends with a total of 4.52%. 19 students have only 1 friend, namely 12.26%. 30 students consider themselves with 2 friends, being a total of 19.35%. 23 students with 3 friends being a total of 14.84%. 23 students with 5 friends being a total of 6 14,84%. 12 students with 6 friends, a total of 7.74%. 4 students with 7 friends, a total of 2.58%. 2 students with 8 friends being a total of 1.29%. Finally, only 1 student consider to have 12 friends, being a total of 0,65%.

Section B

1 a-

 [pic 3]

Figure 3 – Number of text by number of friends (n=155).

1 b -

r= 0,312433

y = 2,7934x + 19,451
R² = 0,0976

1 c –

R= 0,312433. It means that is no correlation between the numbers of friends and texts. A value near zero means that there is a random, nonlinear relationship between the two variables

R 2 = 0.0976, which means that approximately 9% of the total variation in texts can be explained by the linear relationship between number of friends and number of texts.  The other 91% of the total variation in the texts remains unexplained.

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