The article “From Dark to Light: Skin Color and Wages among African Americans” (J. Human Res. 2007: 701–738) includes the following information on hourly wages ($) for representative samples of the indicated populations.

a. Does population mean hourly wage appear to depend on skin color? Carry out an appropriate test of hypotheses.
b. Identify significant differences among the μ_i’s at the .05 significance level.

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Skin color White Light Black Medium Black Dark Black n 513 51 177 207 X 15.94 14.42 13.23 11.72 S 7.73 6.05 6.64 5.60