To determine the correct level of measurement for the variable "Volume of water used by a household in a day," let's examine the different levels of measurement: Nominal, Ordinal, Interval, and Ratio.
1. Nominal Level:
- This is the most basic level of measurement.
- It classifies data into distinct categories without any order or ranking between the categories.
- Examples: Gender, Eye color, etc.
- The volume of water cannot be classified as nominal because it involves quantitative data that can be compared.
2. Ordinal Level:
- This level classifies data into categories that have a distinct order or ranking but the differences between the ranks are not uniform.
- Examples: Movie ratings (poor, fair, good, excellent), class rankings.
- The volume of water does not fit here because it does not involve an ordered ranking or discrete categories.
3. Interval Level:
- This level involves data with meaningful intervals between values, but there is no true zero point.
- Examples: Temperature (in Celsius or Fahrenheit), Calendar dates.
- Although the interval level allows for meaningful comparisons between intervals, it does not have a true zero, which is needed for measuring volumes consistently.
4. Ratio Level:
- This is the highest and most informative level of measurement.
- It includes a true zero point, allowing for the comparison of absolute magnitudes and the calculation of ratios.
- Examples: Age, Weight, Height.
- The volume of water used by a household in a day is a continuous measure with a true zero point (no water usage at all), and it allows for comparisons using ratios (e.g., one household uses twice as much water as another).
Given this detailed breakdown, the volume of water used by a household in a day falls under the Ratio level of measurement.
Therefore, the correct answer is:
OC. Ratio
