ospital workers who are routinely involved administrative radioactive tracer to patients are subject to a radiation exposure emanating from skin of the patient. In an experiment to assess the amount of this radiation levels were measured at a distance of 50 cm from n=28 patients who had been injected with a radioactive tracer, and a sample mean of 5.145 and sample std. s= 0.7524 are obtained. Can we be 95% confident that the average radiation level at a 50 cm. distance from patient is no more than about 5.5?

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Hospital workers who are routinely involved administrative radioactive tracer to patients are subject to a radiation exposure emanating from skin of
the patient. In an experiment to assess the amount of this radiation levels were measured at a distance of 50 cm from n=28 patients who had been
injected with a radioactive tracer, and a sample mean of 5.145 and sample std. s= 0.7524 are obtained.
Can we be 95% confident that the average radiation level at a 50 cm. distance from patient is no more than about 5.5?

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