Use the posted Income.csv dataset and R-script and perform analysis of variance
(ANOVA) based on the following procedure:

1. One way ANOVA to compare mean salary based on:
a. workclass
b. education
c. marital.status
d. occupation
e. relationship
f. race
g. gender

2. ANOVA using two factors:
a. race and gender
b. workclass and education
c. marital.status and relationship
i. occupation and

3. Use ggplot2 to visualize part 2.

4. Identify the groups with different means in 1 and 2 using pairwise t-test.

5. Identify a single factor that can best explain differences in the salary.

6. Visualize the correlation matrix.

7. Elaborate on your observations.

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