For Exercises 8.49 to 8.51, see page 437; for 8.52 and 8.53, see pages 439–440; for 8.54 to 8.56, see page 440; for 8.57 to 8.58, see page 444; for 8.59, see page 445; and for 8.60, see page 447.
8.54 Social media and the supply chain using plus four.
Refer to Example 8.8 (page 438), where we computed a 95% confidence interval for the difference in the proportions of small companies and large companies that use audio/visual sharing through social media as part of their supply chain. Redo the computations using the plus four method, and compare your results with those obtained in Example 8.8.