Refer to Example 4, Chapter 2, on page 29. Table 2 records the number of items returned

Question:

Refer to Example 4, Chapter 2, on page 29. Table 2 records the number of items returned by 30 persons to a large discount department store in late December. The summary statistics are
n = 30, = 2.538, s = 1.303
Obtain a 98% confidence interval for μ, the population mean number of items returned.