Answer:
Ratio
Step-by-step explanation:
First lets understand various scales of measurement in psychology
- Nominal: Separate numbers indicate separate objects. these no actual meaning other than separating between objects.
example: number on vests of football players
2.Ordinal: meaning order
example: place finished in a race 1st , 2nd
3. Interval: have no order
equal interval between the adjacent categories
the difference between two similar physical quantity is same
4. Ratio: Differences are meaningful like interval
ratios are meaningful , Existence of "true zero point"
Now in the above case money is spend to buy candies which is meaningful and if no money is spent no candies are purchased hence existence of "True zero point"
Hence Ratio scale would be most appropriate to measure this case
