A random sample of 30 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 30 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 the 95% confidence interval for the difference in mean word length for these two novels?

a.

b.

c.

d.

e.

Select the best answer.

Transcribed Image Text:

20.0%(4.08 – 3.85) ±2.576 30 305 2.40 2.26 - 0.200 = %3D 1526 V30