In: Statistics and Probability
A nursing professor was curious as to whether the students in a very large class
she was teaching who turned in their tests first scored differently from the overall
mean on the test. The overall mean score on the test was 75 with a standard
deviation of 10; the scores were approximately normally distributed. The mean
score for the first 20 tests was 78. Did the students turning in their tests first score
significantly
different from the mean?