Which of the following statements defines a variable ratio schedule?
1. it refers to how attractive or unattractive an outcome is for a person.
2. it is based on the idea that the number of times a behavior must occur before it is rewarded changes over time.
3. it is concerned with a person’s perceived inputs to a work setting and the outcomes received from that setting.
4. it is a person’s perception of the probability that an increase in effort will result in an increase in performance.
5. it is a person’s perception of the probability that improved performance will lead to certain outcomes.