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 ________. A) t₃₅= -2.40 B) z = -2.40 C) t₃₅ = 2.40 D) z = 2.40

Question

Quizplus · Accepted Answer

The test statistic is calculated using the t-distribution because the sample size is small (n=36). The formula for the t-statistic is (sample mean - population mean) / (sample standard deviation / sqrt(n)). Plugging in the values: (4.4 - 4) / (1 / sqrt(36)) = 2.40.

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