Question: help Erin conducts a study to determine how much time her teachers spend grading papers each week. . She surveys 75 out of 150 teachers.

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Erin conducts a study to determine how much time her teachers spend grading papers each week. . She surveys 75 out of 150 teachers. . She found that teachers in her sample spend an average of 4.25 hours grading papers each week. . The standard deviation is 0.75 hours. . The margin of error = 2 . where s is the standard deviation and n is the sample size. What can Erin do to reduce the margin of error? O A. increase the average to 4.5 hours O B. increase the population size to 200 teachers O C. increase the standard deviation to 1.5 hours O D. increase the sample size to 90 teachers

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