D Question 16 1 pts A schoolteacher is worried that the concentration of dangerous, cancer- causing radon gas in her classroom is greater than the safe level of 4pCi/L. The school samples the air for 36 days and finds an average concentration of 4.4pCi/L with a standard deviation of 1pCi/L. To test whether the average level of radon gas is greater than the safe level, the appropriate hypotheses are O Ho: M 2 4.4, HI: M 4.0 O Ho: X = 4.4, H1 : X * 4.4 O Ho: M = 4.0, H1: M / 4.0