Dr.Hissa Alzahrani
The relationship between body weight and exercise
Step 1 Making an Observation: 1 point
regular exercise reduces body weight in many people.
Step 2 Formulating Hypothesis : 1 point
“The average loss of body weight of people who exercise is greater than the average loss of body weight of people who do not exercise.”
Note: we will study more quantitive measurements in chapter 3
Step 3 Designing an Experiment:
Population and sample: 1 point
Population is all the students in biology department, Sample is 20 students from biology department.
Source of data: 1 point Interview the students.
Sampling method: 1 point Systematic sampling
Study design and why: 1 point
Case-control study because it is appropriate to investigate the relationship between the two variables.
Study variables: (at four three variables) 4 points
Variable Type measurement scale
(values)
Data values Dependent/independen t
weight Quantative (continues)
ratio Kg numbers…… dependent
height Quantative (continues)
ratio Cm numbers…… independent
Practice exercise (per week)
qualitative ordinal 0 , 1-3, 4-6, >6 (Hour numbers)
independent Health problems qualitative nominal Yes or No independent Medications use Qualitative nominal Yes or No independent
20 points
Dr.Hissa Alzahrani Collect data: 4 points
Student number Weight(kg) Height(cm) Practice exercise (by hours)
Health problems Medication use
1 56 170 1-3 no no
2 62 165 4-6 no no
3 73 155 0 yes yes
4 54 174 4-6 no no
5 65 165 1-3 no no
6 45 166 4-6 no yes
7 66 163 0 yes no
8 67 162 0 no no
9 71 168 0 no no
10 56 170 1-3 no no
11 62 156 4-6 no no
12 73 167 4-6 yes yes
13 54 156 4-6 no no
14 65 154 0 no no
15 45 150 4-6 yes yes
16 56 165 1-3 no no
17 55 159 1-3 no no
18 50 160 4-6 no no
19 65 156 1-3 yes no
20 63 156 1-3 no yes
Descriptive statistics: 4 points
Figure 1
Figure 2
Dr.Hissa Alzahrani Figure 3
Descriptive Statistics
N Minimum Maximum Mean
Std.
Deviation height 20 150.00 174.00 161.8500 6.45042
Table 1
Step 4 Conclusion: 2 points
We conclude through data collection the following points : 1- The histogram of weight variable is bimodal, from figure 1
2- most of the biology students have good health status and not using medications, from figure 2 3- less exercises hours associate with high weight values, from figure 3
4- the height variable have average 161.8 with high standard deviation.
Then we draw our conclusion based the previous results that the exercises reduce the body weight.
