There are a lot of tricks and shortcuts, and of course, the pencil and paper add-em-up method of finding the average of a set of numbers.
What's your best way to get the average of those eight numbers?
The Counterfeit Bill problem (Sobel and Maletsky 1999).
A customer enters a store and purchases a
pair of slippers for $5, paying for the purchase with a $20 bill. The merchant,
unable to make change, asks the grocer next door to change the bill. The
merchant then gives the customer the slippers and $15 change.
customer leaves, the grocer discovers that the $20 bill is counterfeit and
demands that the shoe-store owner make good for it. The shoe-store owner does
so, and by law is obligated to turn the counterfeit bill over to the FBI.
much does the shoe-store owner lose in this transaction?
100 students were surveyed about their preferences for bell peppers (capsicum), carrots and spinach, with the following results:
① 72 students said they like bell peppers, and 36 students said they like only bell peppers.
② 41 students said they like carrots, and 9 students said they like only carrots.
③ 31 students said they like spinach, and 3 students said they like only spinach.
④ 9 students said they like neither bell peppers, nor carrots, nor spinach.
What is the best way to model/analyze this survey data?
Graphically (and what type of graph)?