Data can be divided into four levels of measurement. The interval level of measurement includes data that can be ordered, and the difference between the values is meaningful. For example, the temperature in a desert is measured in degrees Celsius and can be ordered from low to high. The difference between the highest and the lowest values indicates how much the temperature changes in a day. But, a nighttime temperature of zero degrees Celsius does not mean there is no temperature; on the contrary, it is quite cold. So, the interval level of measurement does not have a natural zero point. On the contrary, consider a catalog of computer prices. Zero dollars means no cost. So this data set has a natural zero point and cannot be considered for interval level of measurement.