Page 171 - DMGT209_QUANTITATIVE_TECHNIQUES_II

Quantitative Techniques-II

Notes Rank the following attributes of 1–5 scale according to the importance in the microwave oven:

Did u know? What is the difference between nominal and ordinal scales?
In nominal scale numbers can be interchanged, because it serves only for the purpose of
counting. Numbers in Ordinal scale have meaning and it won’t allow interchangeability.

Interval Scale

Interval scale is more powerful than the nominal and ordinal scales. The distance given on the
scale represents equal distance on the property being measured. Interval scale may tell us “How
far the objects are apart with respect to an attribute?” This means that the difference can be
compared. The difference between “1” and “2” is equal to the difference between “2” and “3”.

Example:
1. Suppose we want to measure the rating of a refrigerator using interval scale. It will
appear as follows:
1. Brand name Poor ———————— Good
2. Price High ———————— Low
3. Service after-sales Poor ———————— Good
4. Utility Poor ———————— Good
The researcher cannot conclude that the respondent who gives a rating of 6 is 3 times
more favourable towards a product under study than another respondent who awards
the rating of 2.
2. How many hours you spend to do class assignment every day?
< 30 min.
30 min. to 1 hr.
1hr. to 1½ hrs.
> 1½ hrs.
Statistical implications: We can compute the range, mean, median, etc.

Task Analyse the difference between interval and ordinal scales.

Ratio Scale

Ratio scale is a special kind of internal scale that has a meaningful zero point. With this scale,
length, weight or distance can be measured. In this scale, it is possible to say, how many times
greater or smaller one object is being compared to the other.

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