Sahila Mahajan
Group-6
Roll no-37

Ratio: A ratio scale is an interval scale that has a natural reference point. Height or length are examples. The reference point of zero had real and natural meaning and one measurement on a ratio scale can be expressed as a ratio or percentage of another. Consider saying that 10 o'clock is 100% later than 9 o'clock. These are interval scales but not ratio scales.

A ratio compares two numbers that represent the relationship of two items measured in the same way. For example, items may merely be counted. If a population of laboratory rats contains 40 males and 60 females, the ratio of males to females would be 40 to 60 (40:60 or 40/60).

Interval: If we can measure things on a scale with meaningful intervals we are using an interval scale. Interval scales have no or an arbitrarily set reference point. Consider time and temperature. The difference between 0 and 1 seconds is the same as between 95 and 96 seconds or 19,222 and 19,223 seconds. The intervals are defined and measurable but the reference point of time = 0 is arbitrarily chosen.

Though there is slight difference, in statistics this difference is neglected and both ratio and interval are considered as a similar term.

Source-wikipedia.org