e 4. A company a new for than the treatment ope is that treatment on the gloves
ID: 3225614 • Letter: E
Question
e 4. A company a new for than the treatment ope is that treatment on the gloves in use for this will more effectively prevent wear gloves currently on the market. company w recruit 50 male gymnasts as volunteers who wear the gloves as they usually would for six months. An employee at the company experimental design whereby the 50 gymn would be randomly assigned suggest an with the new of 25. would be given gloves treatment and the other would be given gloves with the current treatment. At the end of the study the wear on the gloves with the new treatment would be compared to the wear on the gloves with the current treatment. (a) How would you assign the 50 gymnasts to the two groups of 25 for a completely randomized design? (b) Why would the groups be assigned randomly rather than, for example, a some of the gymnasts to choose which group they would be in?Explanation / Answer
(a)
In completely randomized design a statistician randomly allocated the subject to one of the two conditions. One group receives a treatment and another one receives a placebo. In our case, we assign one randomly chosen group to the newly created treatment of the gloves and rest will be given the already available treatment in the market.
A completely randomized design depends on randomization to control for the effects of external variables. The experimenter assumes that, on average, external factors will affect treatment conditions equally; so any significant differences between conditions can fairly be attributed to the independent variable.
(b)
In completely randomized design the subject does not know in which group he or she is, that is he never knows that has he received a treatment or placebo. For example, in pharmaceutical tests, one group receives a medication and another group receives a placebo(a look-alike tablet but contains no medication), but they never know in which group they are. This helps the experimenter to tackle what is called the placebo effect, in which case those who didn't receive medication tend to get healed. This is a psychological effect that they feel they were healed by this medication yet they get healed themselves.
Hence in our study, we can't let them choose in which group would get, this diminishes the value of the experiment as someone who knows that he got treatment would psychologically feel that this is better or not better depending on their behavior. This is sometimes called personal biases. we cannot let personal biases creep into our experiment.
(c)
This is even better than the first technique in the way that both the gloves in the hand of a particular subject will essentially be in the same conditions, both will go through the same usage as the gymnast has to use both hands in his or her acts, so both gloves will go through equal usage, and since gymnast is in complete ignorance of which glove is in treatment group and which is in placebo group, only the experimenter knows which is which, no personal biases will seep into the experiment either.
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