In problem 3.8, you computed mean and median income for 13 Canadian provinces and territories in two separate years. Now compute the standard deviation and range for each year, and, taking account of the two measures of central tendency and the two measures of dispersion, write a paragraph summarizing the distributions. What do the measures of dispersion add to what you already knew about central tendency?

Did the provinces become more or less variable over the period? The scores are reproduced here.

Province or Territory 2000 2006 Newfoundland and Labrador 38,800 50,500 Prince Edward Island 44,200 56,100 Nova Scotia 44,500 56,400 New Brunswick 43,200 54,000 Quebec 47,700 59,000 Ontario 55,700 66,600 Manitoba 47,300 58,700 Saskatchewan 45,800 60,500 Alberta 55,200 78,400 British Columbia 49,100 62,600 Yukon 56,000 76,000 Northwest Territories 61,000 88,800 Nunavut 37,600 54,300