4 Suppose we measure people on a variable called ‘sociability’ (‘S’ for short).We then investigate their performance on a wiggly-wire task where touching the wire with a metal loop-on-a-stick causes a buzzer to sound and records an error. Suppose it is true that high S people perform well in front of an audience but poorly alone, and that low S people perform the other way round. Overall, high and low S people tend to perform at about the same level. What effects would you expect from ANOVA? Sketch the expected effects or choose the appropriate diagram from Figure 19.4.