Is anyone manipulating a variable?
a. All students buying textbooks
b. Textbooks purchased
c. 100 students
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
1 answer
1 answer