STATS 7 Lecture Notes - Lecture 7: Multiple Choice
Document Summary
Slide 2: anecdotal evidence, volunteers (choose involvement), and convenience samples (asking whoever is around) are all poor methodology when sampling data, probability sampling is the best way because it is unbiased (random selection, movie example: Day and ghostbuster both received a 5. 3 average score on imdb. By looking at the data you see that id had 140k ratings with a general peak in data, and ghostbusters had. 160k ratings, with 2+ peaks in the data: demographics also show that ghostbusters was rated 1 star by mostly male voters, and the few 5 stars it received were from female. Some ratings were to spite the other voters who rated too low or too high, so the quality of the film isn"t necessarily told by these scores.
