you conduct a survey of a sample of 25 members of this years graduating marketing students and find that the average GPA is 3. The standard deviation...

you conduct a survey of a sample of 25 members of this years graduating marketing students and find that the average GPA is 3.2. The standard deviation of the sample is .4. Over the last ten years, the average GPA has been 3.0. Is the GPAS of this years students significantly different from the long-run average? At what alpha level would it be significant?