We are now interested in the relationship between level of education and annual earnings.

a) Present the null and alternative hypotheses.

b) Build a box-and-whisker plot with education level as a variable independent. Correctly identify the axes. That you show the graph about the relationship between the level of studies and the annual remuneration?

c) Build the ANOVA table and then determine if the relationship between the two variables at the study is statistically significant at the = 0.05 significance level. do all the stages of the test process. Do not forget to present a conclusion in the light of the results obtained.

d) What is the difference between residual variance and explained variance? Take it time to define the concepts and explain the values obtained.