A researcher studies water clarity at the same location in a lake on the same da

Question

A researcher studies water clarity at the same location in a lake on the same dates during the course of a year and repeats the measurements on the same dates 5 years later. The researcher immerses a weighted disk painted black and white and measures the depth (in inches) at which it is no longer visible. The collected data is given in the table below Complete parts (a) and (b) below Observation 2 34 5 6 Date Initial After five years 70.6 31.2 66.6 66.9 39.9 48.2 1/25 3/19 5/30 7/3 9/13 11/7 74.7 35.3 68.3 65.1 43.7 45.3 (a) Why is it important to take the measurements on the same date? 0 A. Using the same dates makes the second sample dependent on the first. 0 B. Those are the same dates that all biologists use to take water clarity samples. ° C. Using the same dates makes it easier to remember to take samples. 0 D. Using the same dates maximizes the difference in water clarity.

Explanation / Answer

When taking data on the same dates over a period of time, we expect that most other variables on that particular day would be a constant (temperature, wind, humidity) and also time would become a constant. The only variable would be measurements taken, which would then make the second sample dependent on the first. Hence OPTION A

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