Question

A particular ranking system determines the cost of living in the most expensive cities in the world as an index. This index scales city X as 100 and expresses the cost of living in other cities as a percentage of the city X cost. For​ example, in​ 2007, the cost of living index in city Y was

125.7

​,

which means that it was

26

​%

higher than city X. The accompanying scatterplot shows the index for 2007 plotted against the 2006 index for

15

cities. Complete parts a through e below.

c) Find the correlation. The correlation coefficient is nothing . ​(Round to three decimal places as​ needed.)

City	Index_2006	Index_2007
1	117.3	125.7
2	121.8	122
3	102.3	104.3
4	93	95.8
5	111.7	119.6
6	112.9	124.8
7	95.3	97.3
8	109.9	111.5
9	100.5	101.8
10	95.8	103.6
11	121.2	121.4
12	119.3	124.6
13	105.9	118.3
14	111.2	119.4
15	111.3	115.8

Answer 1

The above table and graph is showing the strong positive correlation beween index 2006 and index 2007 i.e. 0.920 and the p-value is 0.000 which is showing the result is statistically significant.