What are you drinking? Environmental Protection Agency standards require that the amount of lead in drinking water be less than 15 micrograms per liter. Ten samples of water from a particular source have the following concentrations, in units of micrograms per liter: 11.6 14.4 11.7 14.6 15.7 9.0 12.7 8.7 12.1 17.9 Send data to Excel (a) Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test. (b) Following is a dotplot of the data. Is it reasonable to assume that the population is approximately normal? ... .. 10 12 14 16 18 20

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