Questions: A new mother keeps track of the time when her baby wakes up each morning. What is the level of measurement of the data? Select the correct answer below: Nominal Ordinal Interval Ratio

The answer is Ratio.

Explanation for each option:

1. Nominal: This level of measurement is used for data that can be categorized but not ordered. Examples include gender, race, or types of fruit. Since time can be ordered and has meaningful differences, this is not the correct level.

2. Ordinal: This level involves data that can be ordered or ranked, but the differences between the data points are not meaningful. An example is a ranking of satisfaction levels (e.g., satisfied, neutral, dissatisfied). Time can be ordered, but it also has meaningful differences, so this is not the correct level.

3. Interval: This level of measurement involves ordered data with meaningful differences between values, but it does not have a true zero point. An example is temperature in Celsius or Fahrenheit. Time of day does not have a true zero point, but when considering the time elapsed from a fixed point (like midnight), it can be treated as interval data. However, when considering the time elapsed from a fixed point like the start of the day, it can be treated as ratio data.

4. Ratio: This level of measurement includes all the properties of interval data, with the addition of a true zero point, allowing for the calculation of ratios. Examples include height, weight, and time elapsed. Since the time when a baby wakes up can be measured from a true zero point (midnight or the start of the day), and you can say one time is twice as long as another, it is considered ratio data.