For Daisy Arabella only

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