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The time required to start a business, defined as the number of days needed to complete the procedures to legally operate a business, in 20 developed countries and 20 emerging countries is included in the accompanying table. Assuming that the population variances for developed countries and emerging countries are not equal, is there evidence of a difference in the mean time required to start a business between developed countries and emerging countries? (Use a= 0.05.) Compare these results to those from the test for equal means when the variances are assumed to be equal.
Let u be the mean time required to start a business in developed countries and let uy be the mean time required to start a business in emerging countries. What are the null and alternative hypotheses?