Dr. Chapman has conducted an experiment in which participants watched paint dry

Question

Dr. Chapman has conducted an experiment in which participants watched paint dry for 30 minutes twice, once being paid $1 and once being paid $30. When comparing the samples, he calculated t = 5.57. He assumed a = .05 with df = 5, so the tcv = ±2.571. Which of the following is the correct conclusion he can draw with these numbers?

A. Not enough information is available to properly draw a conclusion

B. Dr. Chapman fails to reject the null hypothesis

C. Dr. Chapman can accept the alternative hypothesis

D. Dr. Chapman can reject the null hypothesis

Marcus conducts a study on whether patients at his clinic experience higher amounts of psychological distress compared to patients in general. If Marcus concludes that his sample differs from the population when in reality there is no difference, he has committed:

A. Type I error

B. Type II error

C. Type III error

D. Marcus has not committed an error

Explanation / Answer

as t stat is higher then critical value

hence option D is correct

D. Dr. Chapman can reject the null hypothesis

A. Type I error

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