I need help with 2.1.38. Abcd are tough and I need an explanation

Business survey Exercises 2.1.38 and 2.1.39 use the following information. In order to understand reasons why consumers visit their store, a local business conducts a survey by asking the next 100 people who visit their store to fill out a short survey. The business finds that 40 of the 100 people state that the main reason they visited the store was because the store is running a sale on coats that week. 2.1.38 Identify each of the following by describing it or stating its val- ue (where possible). a. Population of interest b. Sample C. Parameter of interest d. Statistic 2.1.39 In Exercise 2.1.38, explain whether or not you believe the sam- ple is representative of the population of interest and why