Question 1165483
This is a classic experiment setup. Here are the answers based on the principles of experimental design:

## a. What is the independent variable?
The independent variable (IV) is the factor the experimenter **manipulates** or changes.

* **Independent Variable:** **Type (or Amount) of Reward**
    * **Levels:** Large Reward, Small Reward, and No Reward.

## b. What is the dependent variable?
The dependent variable (DV) is the factor that is **measured** to see if the manipulation of the IV had an effect.

* **Dependent Variable:** **Number of Words Recalled** (Memory performance).

## c. What kind of scale is being used to measure the dependent variable?
Scales of measurement describe the nature of the numbers assigned to the observations.

* **Dependent Variable Measurement:** The number of words recalled (e.g., 5 words, 10 words, 15 words).
* **Scale:** **Ratio Scale**

### Why Ratio Scale?

A ratio scale has all the properties of an interval scale (equal intervals/differences are meaningful) plus:
1.  **A True Zero Point:** A score of zero (0 words recalled) represents the complete absence of the property being measured (the absence of recall).
2.  **Ratios are Meaningful:** Recalling 10 words is literally twice as many as recalling 5 words.