Chapter 2, Problem 20P

Fowler and Christakis (2008) report that personal happiness tends to be associated with having a social network including many other happy friends. To test this claim, a researcher obtains a sample of n = 16 adults who claim to be happy people and a similar sample of n = 16 adults who describe themselves as neutral or unhappy. Each individual is then asked to identify the number of their close friends whom they consider to be happy people. The scores are as follows:

Happy:	8	7	4	10	6	6	8	9	8	8
	7	5	6	9	8	9
Unhappy:	5	8	4	6	6	7	9	6	2	8
	5	6	4	7	5	6

Sketch a polygon showing the frequency distribution for the happy people. In the same graph, sketch a polygon for the unhappy people. (Use two different colors, or use a solid line for one polygon and a dashed line for the other.) Does one group seem to have more happy friends?