4. A sociologist survéys 50 randomly selected citizens in each of two countries to compare the mean number of hours of volunteer work done by adults in each. Among the 50 inhabitants of Genovia, the mean hours of volunteer work per year was 52, with population standard deviation, o, 11.8. Among the 50 inhabitants of Wakanda, the mean number of hours of volunteer work per year was 37, with population standard deviation, o, 7.2. Construct the 99% confidence interval for the différence in mean number of hours volunteered by all residents of Genovia and the mean number of hours volunteered by all residents of Wakanda.

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