In 1980, scientists in the Netherlands conducted a national inquiry on water quality (Source: Zoeteman, B.C.J. (1980) Assessment of Water Quality, Sensory, Oxford: Pergamon Press). A part of the study involved eight communities with surface water supplies. The scientists wanted to study the effect of water hardness and one of the objectives was to examine the relationship between the amount of magnesium (x; mg per litre) in the water and its taste (y; on a O{bad} - 100 {good} scale). The data were as follows: Taste (y) Magnesium (x) 25 8.7 25 9 26 11 48 8.5 65 9.2 87 12 90 12 100 18 Enter the data above into SPSS and answer the following. 1. Determine the correlation coefficient r between the two variables.