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Confidence interval for the difference in mean

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A random sample of thirty words from Jane Austen's Pride and Prejudice had a mean length of 4.08 letters with a standard deviation of 2.40. A random sample of thirty words from Henry James's What Maisie Knew had a mean length of 3.85 letters with a standard deviation of 2.26. Which of the following is a correct expression for a 95% confidence interval for the difference in mean word length for these two novels?

Reference no: EM132495430

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