The file retentiondata.

x

ls

x

gives retention data on a sample of magazine subscribers. Some of this data is shown in Figure 19-3. For example, the first person was a subscriber for 7 years and is no longer a subscriber, while the 13th person has been a subscriber for one year and is still a subscriber. Use this data to estimate the magazine's annual retention rate for a customer.\ \\\\table[[Person,Years,Still],[1,7,no],[2,6,no],[3,4,no],[4,1,no],[5,7,no],[6,8,no],[7,3,no],[8,7,no],[9,8,no],[10,1,no],[11,7,no],[12,1,no],[13,1,yes],[14,1,no],[15,6,no],[16,1,no],[17,31,no],[18,61,no]]\ Figure 19-3 Retention data for Problem 5

5. The file retentiondata. x1s gives retention data on a sample of magazine subscribers. Some of this data is shown in Figure 19-3. For example, the first person was a subscriber for 7 years and is no longer a subscriber, while the 13 th person has been a subscriber for one year and is still a subscriber. Use this data to estimate the magazine's annual retention rate for a customer. Figure 19-3 Retention data for Problem 5