## Scatter Diagrams Exercise

For each of the following sets of data, draw a scatter diagram and state whether there appears to be a linear positive correlation, a linear negative correlation or no correlation. (A correlation is a relationship or a connection.)

If there is a correlation, sketch the line of best fit.

1. The table shows the average hours of sunshine for the biggest towns in each of two islands, over the past 15 years.

 Years 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 Top Island 2310 2100 1930 2190 1990 2130 2010 2430 2130 2290 2240 2110 2540 1890 2320 Bottom Island 1650 1550 1440 1590 1490 1620 1570 1740 1650 1540 1520 1580 1870 1450 1710

2. The table shows the areas and maximum depths of ten of New Zealand's lakes.

 Lake name Area of lake (km2) Maximum Depth (m) Taupo 606 163 Rotorua 80 45 Wairarapa 80 3 Ellesmere 181 2 Waikaremoana 54 248 Hauroko 71 462 Wanaka 193 311 Tarawera 36 87 Hawea 141 384 Monowai 31 161

3. The table shows the total amount of money spent on road safety campaigns by a country and the number of road deaths each year.

 Year 89 90 91 92 93 94 95 96 97 98 Money spent (\$millions) 2.3 3.4 2.9 1.7 1.9 2 2.9 3.4 4.5 6.1 Number of road deaths 510 420 480 550 540 525 490 430 410 375