Please see PNG.2

Suppose the researchers hypothesised that there would be a significant difference between 30 to 39 year olds and 40 to 49 year olds. How would you set up the contrast coeficients for each age group to test this hypothesis? 18 to 29 year olds = 30 to 39 year olds = 1 40 to 49 year olds = 50 to 59 year olds =