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A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 9 pCi/L. The

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A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 9 pCi/L. The school samples the air for 49 days and finds an average concentration of 9.4 pCI/L with a standard deviation of 1 pCi/L. Calculate the value of the test statistic. Multiple Choice O t48 = 2.80 O t48 =-2.80 z=2.80 O Z=-2.80

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