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An irate student complained that the cost of textbooks was too high. He randomly surveyed 36 other students and found that the mean amount of

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An irate student complained that the cost of textbooks was too high. He randomly surveyed 36 other students and found that the mean amount of money spent for textbooks was $121.60. If the standard deviation of the population was $6.36, find the 90% confidence interval of the true mean

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