Mercury is a toxic metal that is used in many industrial applications. Seven measurements, in milligrams per cubic meter, were taken of the mercury concentration in a lake, with the following results. Assume that the population of measurements is approximately normally distributed.

Can you conclude that the mean concentration is greater than 1 milligram per cubic meter? Use the α = 0.05 level of significance.

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1.02 1.23 0.91 1.29 1.01 1.35 1.43