Mathematics, 03.08.2021 14:00 annette211pdd8v9
7.22 High school and beyond, Part II. We considered the differences between the reading and writing
scores of a random sample of 200 students who took the High School and Beyond Survey in Exercise 7120.
The mean and standard deviation of the differences are read-write = -0.545 and 8.887 points.
(a) Calculate a 95% confidence interval for the average difference between the reading and writing scores of
all students.
(b) Interpret this interval in context.
(c) Does the confidence interval provide convincing evidence that there is a real difference in the average
scores? Explain
Answers: 2
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7.22 High school and beyond, Part II. We considered the differences between the reading and writing...
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