A district official intends to use the mean of a random sample of 900 sixth graders from a very large school district to estimate the mean score that all the sixth graders in the district would get if they took a certain arithmetic achievement test. The official knows that σ=9.4 for such data. Suppose that the district official takes her sample and gets x=61.8. Use the above variance formula to construct a 99% confidence interval for the mean score of all the sixth graders in the district.
A district official intends to use the mean of a random sample of 900 sixth graders from a very large school district to estimate the mean score that all the sixth graders in the district would get if they took a certain arithmetic achievement test. The official knows that σ=9.4 for such data. Suppose that the district official takes her sample and gets x=61.8. Use the above variance formula to construct a 99% confidence interval for the mean score of all the sixth graders in the district.
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 25RE
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A district official intends to use the mean of a random sample of 900 sixth graders from a very large school district to estimate the mean score that all the sixth graders in the district would get if they took a certain arithmetic achievement test. The official knows that σ=9.4 for such data. Suppose that the district official takes her sample and gets x=61.8. Use the above variance formula to construct a 99% confidence interval for the mean score of all the sixth graders in the district.
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