DATABASE FUNDAMENTALS
TYPES OF DATA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Categorical:nominal
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Categorical:ordinal
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Quantitative:discrete
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Quantitative:continuous
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Detailed explanation-1: -The first option for testing uses a liquid chemcial OTO (othotolidine) that causes a color change to yellow in the presence of total chlorine. You simply fill a tube with water, add 1-5 drops of the solution, and look for the color change.
Detailed explanation-2: -The total chlorine level is the sum of the free chlorine and combined chlorine levels in the pool. For a healthy pool, the free chlorine level should be between 1.0 and 3.0 parts per million (ppm). The Centers for Disease Prevention and Control recommends pH 7.2–7.8 for pools and hot tubs.
Detailed explanation-3: -Parts per million (ppm) is calculated by weight. One ppm is equal to 1 pound of chlorine in 1 million pounds of water. One million pounds of water is approximately 120, 000 gallons. Converting to ounces, (1 pound = 16 ounces) 1 ounce of chlorine in 7, 500 gallons equals 1 ppm.