There is an exam with an average score of 78. A diferent test is then handed out to 40 students and the average on that exam was 82 with a standard deviation of 14.

1. At the .01 level did the students do better than expected? (p = .039)

2. How do you explain the 4 point increase?

3. Interpret the p-value:

4. What is the only type of error that could have occurred Answer: