Question 1021441
<pre><font face = "consolas" color = "indigo" size = 4><b>
Hi  
A poll of 20,000 randomly selected college students in the US determined that during the current semester 45% purchase all their course texts from the campus bookstore. 
Population:   All college students in the US
Sample:  The 20,000 randomly selected college students 
Variable: Venue used by students for purchasing course texts (For ex:  College Bookstore)
Type of Study: observational | NOte: In an observational study investigators
observe subjects and measure variables of interest without assigning treatments to the subjects.