Question

Is the following ordinal ratio nominal or interval

Identify the level of measurement of the data and explain what is wrong with the given calculation
in a set data, ,movie ratings are represented as 1 for 1 star, 2 for 2 stars, and 3 for 3 stars the average (mean) of 634 movie ratings is 1.3

Answer 1

On Ordinal scales, you can rank them but not compute differences, ratios or certain calculations on them. You can find modes and medians but not means:

http://en.wikipedia.org/wiki/Level_of_measurement

Answer 2

From the link above - The median, i.e. middle-ranked, item is allowed as the measure of central tendency; however, the mean (or average) as the measure of central tendency is not allowed. The mode is allowed.