You find out that the average 10th grade math test score for
section 6 of the local high school is 87 for the 25 students in the
class. The average test score for all 10th grade math students
across the state is 85 for 1,800 students. The standard deviation
for the state is 3.8. What Z score do you calculate, and what is
the area between the mean and the Z score (found on the table at
the end of the course text)? What does this mean about the
probability of this test score difference occurring by chance? Is
it less than 0.05? Explain.
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