Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. A survey examines the preferences for laundry detergent. & The admissions office wants to estimate the cost of textbooks for students at our college. Let the variable be the total cost of all textbooks purchased by a student this semester. The plan is to randomly identify 100 students and obtain their total textbook costs. The average cost for the 100 students will e used to estimate the average cost. A. Describe the parameter the admissions offices wishes to estimate. a. Describe the population b. Describe the variable involved c. Describe the sample