The research paper that I've chosen is called "An experimental procedure to obtain sound power level of tire/road noise under Coast-By conditions (C. Davo et. al)".
The aim of the research was to test how much sound power that was generated from the interaction between the tires and the road due to the speed of the vehicle.
1. Which quantitative method or methods are used in the paper? Which are the benefits and limitations of using these methods?
The test was carried out by multiple testing of the different speeds. The paper doesn't actually mention exact numbers for how many times the tests were conducted, it only says "The test was carried out multiple times..". The benefit of this quantitative test is that the mean average error will decrease. The limitation in this test is much harder to answer. If you think about it, the test is just concluded one car in a controlled environment (sort of) that does the exact same motion, so I don't really see a downside using multiple testing in this case.
2. What did you learn about quantitative methods from reading the paper?
This test differs from other tests where for example humans are involved, due to the fact that the human is much more complex than a machine. Due to this I think that the data that comes out from multiple testing of a machine can be considered as much more accurate than a compiled survey.
I believe that you can, based on a specific test, be pretty sure whats gonna happen if you have quantitative data. For instants, a car whit a certain weight, speed and tires. It will probably have the same result as if you only look at the quantitative measures that someone else did. If you however asks a person, that you don't know at all a specific question I would say that it is nearly impossible to predict the answer. So the tings that I've learned is that you can make better conclusions if the human factor is ignored.
3. Which are the main methodological problems of the study? How could the use of the quantitative method or methods have been improved?
The overall methodological in this research-paper is I think very well completed. The authors are well aware of the measuring-techniques. they use multiple microphones at different locations, and they also take the microphones frequency-response into account. Due to this, the real sound-power at specific frequencies can be calculated, instead of just measured.
There was only one methodological problem that I saw. The title of the research is "..tire/road noise.." but the authors only measures one tire-type at one road-type. They could instead increased the numbers of both tiers and road conditions to get more quantitative data. The authors has only given a mathematical formula for both road and tire and given out a prediction of the sound-power. This is however a factor that has been criticized by the authors themselves.
Physical activity, stress, and self-reported upper respiratory tract infection
This paper is a study concluded by different people within different areas of expertise. It is a
study that has the aim of finding the relationship between, perceived stress, physical activity and the occurrence of self-reported URTI (Upper respiratory tract infection). The test was conducted by population-based prospective cohort study of 1509 persons. The test persons was to report physical activity and incidence of URTI. The conclusions was that high physical activity was associated with lower risk of contracting URTI.
4. Which are the benefits and limitations of using quantitative methods?
One benefit could be that with quantitative method is, as I described above that you gather a lot of data which make the average error lower. This is a perfect way of gathering data if you are dealing with something less complex. In this paper, the persons was measured according to a scale called MET witch is a physiological measure expressing the energy cost of physical activities. so in this case it gives a pretty good result. It is however limit in the case to get a good average result if you are dealing with more complex questions, like people.
5. Which are the benefits and limitations of using qualitative methods?
The benefit with the qualitative methods are almost the exact opposite as I described above. It is a much better method to use when you'r dealing with more complex test-objects, humans for instance. By making a more qualitative questionnaire face to face with the person in question, you would more likely get a more accurate result compared by an easy survey. The limitation however with this method is that it is very time-consuming and sometimes it takes a long time to get a result. If you however don't have time to wait you would need to hire people and it would be cost-full.
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