Mathematics, 06.10.2019 09:30, yjudon37

Which technique for gathering data (observational study or experiment) do you think was used in the following studies? explain your answer. (a) the u. s. 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).

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Which technique for gathering data (observational study or experiment) do you think was used in the...