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I think it's one of the t-values but not 100% sure. Please help and give an explanation!

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. The value of the test statistic is ___________.


  • t35 = –2.40


  • z = –2.40


  • t35 = 2.40


  • z = 2.40


college   business   statistics   Business-Statistics   
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  • A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is...

    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 Multiple Choice Ho : μ s4.0, Ha : μ > 4.0 O444 H,124.4,Ha : μ < 4.4...

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