Mathematics, 12.02.2020 03:59 eggoysters
A random sample of 85 sixth-graders in a large city take a course designed to improve scores on a reading comprehension test. Based on this sample, a 90% confidence interval for the mean improvement in test scores for all sixth-graders in the city taking this course is found to be (12.6, 14.8). Which of the following are the sample mean and margin of error on which this interval is based?A. Sample Mean = 13.7; Margin of Error = 1.1B. Sample mean = 13.7; Margin of Error = 2.2C. Sample mean is unknown; Margin of Error = 2.2
Answers: 2
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A random sample of 85 sixth-graders in a large city take a course designed to improve scores on a re...
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