A career counselor wants to understand if the average annual earnings differ by educational attainment. The counselor uses three education levels: high school or less, undergraduate degree, and master's degree or more. After collecting data, the resulting incomplete one-way ANOVA table and Tukey's confidence intervals are shown below.

Source of Variation	SS	df	MS	F
Between Degrees			1,936
Within Degrees
Total	8,054	24

	Lower	Upper
Undergraduate-High School	8.23	43.11
Master's-High School	11.89	46.77
Master's-Undergraduate	-12.65	19.98

a. Complete the ANOVA table.

b. Set up the competing hypothesis to test whether there are differences in mean annual salary between the different education levels.

c. At the 5% significance level, what is the conclusion to the test?

d. If significant differences exist, use Tukey's confidence intervals to determine which educational levels have different mean annual earnings.