Final answer:
The number of sales calls is a ratio level measurement, as it allows for the calculation of ratios and has a meaningful zero point.
Step-by-step explanation:
The number of sales calls is a measurement that can be classified as ratio level data. Ratio level data includes a meaningful zero point and allows for the calculation of ratios, making it the highest level of measurement. The measurement tells us the exact count of how many sales calls were made and we can compare this data by ratios or differences. For example, if one salesperson made 10 calls and another made 20, we can say that the latter made twice as many calls, which is meaningful and informative.