Question

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?

Answer 1

1)

null hypothesis:Increasing monetary incentives does not have effect in higher performances on a cognitive task.

2)

alternate hypothesis:

Increasing monetary incentives have a effect in higher performances on a cognitive task.

3)

type I error is null hypothesis is rejected when it is true

so, type I error is

there is an Incentive effect ,when in actual there is no effect

4)

Type II error is fail to reject the false null hypothesis

type II error is there is no incentive effect, when in actual there is an incentive effect

5)

probability of a Type I error is at most 0.01