SIMPLE convenience store is arranging a promotion plan for the next season. The marketing team wants to select 600 registered customers for a survey to get some ideas for the promotion. In the...

Extracted text: SIMPLE convenience store is arranging a promotion plan for the next season. The marketing team wants to select 600 registered customers for a survey to get some ideas for the promotion. In the client's database, an identity number is assigned to each customer from 00001 to 30000 according to the registration date and time. Furthermore, it is known that the number of registered customers in the 4 age groups are as below: 18 - 25: 4,000 customers 26 - 40: 12,000 customers 41 - 60: 9,000 customers Above 60: 5,000 customers (a) Find the population size. (b) Describe the population. (c) How many customers in each age group should be selected if the marketing team is adopting stratified random sampling method based on age groups? (d) Instead of using stratified random sampling method, systematic sampling method is suggested. Write down the identity numbers of the next three customers given that the first chosen customer has identity number 00016. (e) What is the advantage of using systematic sampling method?