Imagine that a professor of psychology has two teaching assistants (TAs) who wil
ID: 3055439 • Letter: I
Question
Imagine that a professor of psychology has two teaching assistants (TAs) who will help him grade assignments for the duration of the semester. The professor wants to make sure that he and the TAs are well calibrated with one another, so he has all three of them grade the first assignment independently. Because the professor grades every assignment on a curve, he first converts the students' scores to z-scores for each grader. The following table shows the z-scores for population of 10 students in his class for each grader Teaching Teaching Professor Assistant #1 Assistant #2 0.70 0.83 -0.98 2.21 -0.54 0.43 1.27 -0.64 0.38 0.80 1.27 Student 1 Student 2 Student 3 Student 4 Student 5 Student 6 Student 7 Student 8 Student 9 Student 101.07 -0.14 0.92 0.10 -2.09 0.85 0.48 0.20 0.30 1.14 0.57 0.04 -0.01 -0.54 The professor is going to use the z-scores to calculate the Pearson correlation between his scores and those of his TAS. To calculate the Pearson correlation, he sums the products of the z-scores. The professor should divide this sum by The professor constructed a table of Pearson correlations between his scores and those of his TAs. Select the correct missing correlationExplanation / Answer
The Professor should divide this sum by 2.
The correct missing correlation between Teaching Assistant # 1 and Professor is 0.42.
Conclusion: The two TAs are well calibrated with each other but not with the Professor.