An instructor at an air traffic control training school is under review by "the board." In her presentation to them, she wants to indicate the level of performance of her students. Rather than using data from all 1500 final exams, she draws a random sample of 31 and computes the mean score in order to set up the 99% CI (table required). Set up the confidence interval for her but let her complete the calculations. Here are her data: Mean = 88%; SE = 8.
What will be an ideal response?
Correct Answer:
df = 30; t .01 = 2.750; 99% CI: 88
± 2.750(8)
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