What is the mean income of stock brokers? Do seat belts save lives? Can lifting

Question

What is the mean income of stock brokers? Do seat belts save lives? Can lifting weights improve runners' times in a 10-kilometer race? Can a new herbal remedy reduce the severity of colds? Example 5 For each of the following questions, what type of statistical study is most likely to lead to a conclusion? If it is observational is it retrospective or prospective? If it is an experiment, should there be any blinding? a) What is the mean SAT score? b) Does a new drug help reduce the hyper-activity in young children? c) I wonder if students who wear blue shirts on the first day of class will perform better throughout the course. Assignment-p. 28-29-11-32

Explanation / Answer

Which type of study?
- Because it asks to take out a statistical measure it is a Quantitative study
- Will be answered by a Yes/No, so again is a Qualiative study
- Because it asks to take out a statistical measure it is a Quantitative study
- Will be answered by a Yes/No, depending upon the severity after remedy is given

5. Type of stat test
a. Mean of SAT scores which have already been scored in the past means that we have to take out a "Retrospective Score"
b. This is experimental, as we have to create experiments i.e. activity of children with drug vs. w/0 drugs.Blinding is required
c.Observational, prospecitive , as it will be observed and is not an experiment or an retrospective observation

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