Agreeableness, gender, and wages. Refer to the Journal of Personality and Social Psychology (Feb. 2012) study of on-the-job agreeableness and wages, Exercise 12.132

(p. 753). Recall that the researchers modeled mean income, E(y), as a function of both agreeableness score (x1) and a dummy variable for gender (x2 = 1 if male, 0 if female). The data was used to fit the model E1y2 = b0 + b1x1 + b21x122 + b3x2. A MINITAB normal probability plot of the residuals is displayed here.

Interpret the graph. Does the random error term in the model appear to be normally distributed?

Transcribed Image Text:

Percent 99.9 99- 95- 90- 80- 70 60 50- 40 30- 20- 10- 5- 1- Normal Probability Plot (response is Income) 0.1 -30000 -20000 -10000 0 Residual 10000 20000 30000