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.At a 5% significance level,the critical value(s)is(are)_______.
A) −1.690
B) 1.690
C) −1.96 and 1.96
D) −2.030 and 2.030

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The Answer of 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.At a 5% significance level,the critical value(s)is(are)_______.
A) −1.690
B) 1.690
C) −1.96 and 1.96
D) −2.030 and 2.030

A Schoolteacher Is Worried That the Concentration of Dangerous,cancer-Causing Radon