Which technique for gathering data (observational study or experiment) do you th
ID: 3068422 • Letter: W
Question
Which technique for gathering data (observational study or experiment) do you think was used in the following studies? Explain your answer. (a) The US. Census Bureau tracks population age. In 1900, the percentage of the population that was 19 years old or younger was 44.4%. In 1930, the percentage was 38.8%; in 1970. the percentage was 37.9%; and in 2000, the percentage in the age group was down to 28.5% (The First Measured Century, T. Caplow, L. Hicks, B. J·Wattenberg) This is an observational study because a treatment was deliberately imposed on the individuals in order to observe a possible change in the response or variable being measured. This is an observational study because observations and measurements of individuals are conducted in a way that doesn't change the response or the variable being measured O This is an experiment because observations and measurements of individuals are conducted in a way that doesn't change the response or the variable being measured. This is an experiment because a treatment was deliberately imposed on the individuals in order to observe a possible change in the response or variable being measured.Explanation / Answer
Before answering this question we need to understand the concept of observational study and experimental study:
(a) Correct option is (B)
This is an observational study because observation and measurement of individuals are conducted in a way that doesn't change the response or the variable being measured.
(b) Correct option is (C)
This is an observational study because observation and measurement of individuals are conducted in a way that doesn't change the response or the variable being measured.
In both the case we can see observer doesn't control or tried to change the response variable.
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