After solving, the observed statistic for this study is 2.5.
In the given question, a professor collected data.
After fishing a test, the 27 students in the class wrote their pedicted scores on their tests and these were compared with the actual scores after they were graded.
The mean predicted score was 83.7. So SD = 83.7.
The mean actual score was 81.2. So SD = 15.6
the aen of the difference was 2.5. So SD = 8.6
Null: The average difference in test score (predicted-actual) is 0. μ = 0
Alternative: The average difference in test score (predicted-actual) is greater than 0. μ > 0
We have to find the observed statistic for this study.
predict mean = 83.7 S.D = 8.6
actual mean = 81.2 S.D = 15.6
n = 27
x = (predict mean - actual mean )
x = 83.7 - 81.2
x = 2.5
Hence, the observed statistic for this study is 2.5.
To learn more about statistic link is here
brainly.com/question/29657446
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The right question is given below:
