The effect of a monetary incentive on performance on a cognitive task was investigated. The researcher predicted that greater monetary incentives would result in higher performance. Participants were told that they would receive either 5 cents, 25 cents, or 50 cents for each word puzzle that they correctly solved. A statistical test showed that there was a significant effect of incentive on performance at the .01 level. The greater the incentive, the more puzzles were solved. 

1. What is the null hypothesis? 

2. What is the research hypothesis? 

3. What would be the Type I error?

 4. What would be the Type II error? 

5. What is the probability of a Type I error?